Study sets matching "muscle contraction"

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Study sets matching "muscle contraction"

9 terms
Muscle contraction
Atrophy
Adduction
Abduction
Concentric
Muscle decreases due to lack of activity
Towards a body midline
Away from the mid line... (Front raises)
Muscle shortens (extending arm)
Atrophy
Muscle decreases due to lack of activity
Adduction
Towards a body midline
10 terms
Muscle Contraction
Agonist
Antagonist
Synergist
Fixator
Prime mover (shortens)
Assists the prime mover (lengthens)
Helps to steady the movement
Assists in stabilising the agonist
Agonist
Prime mover (shortens)
Antagonist
Assists the prime mover (lengthens)
14 terms
Muscle Contraction
sliding filament theory
action potential
synapse
acetylcholine
theory that explains how muscle contraction occurs
an electrical charge that travels along a nerve fiber or musc…
region where communication occurs between two neurons or neur…
neurotransmitter involved with muscle contraction (ACh)
sliding filament theory
theory that explains how muscle contraction occurs
action potential
an electrical charge that travels along a nerve fiber or musc…
Muscle Contraction
muscle contraction step 1
muscle contraction step 2
muscle contraction step 3
muscle contraction step 4
calcium is released from sarcoplasmic reticulum
calcium in sarcoplasm binds troponin and exposes myosin bindi…
myosin heads bind to actin; release of Pi initiates power str…
in the power stroke, the myosin head changes conformation; fi…
muscle contraction step 1
calcium is released from sarcoplasmic reticulum
muscle contraction step 2
calcium in sarcoplasm binds troponin and exposes myosin bindi…
6 terms
Muscle Contraction
step one
step two
step three
step four
nerve impulse arrives at skeletal fiber
impulse conducted over sarcolemma
calcium is released form s. reticulum
calcium combines with troponin (troponin prevents myosin from…
step one
nerve impulse arrives at skeletal fiber
step two
impulse conducted over sarcolemma
Muscle Contraction
motor unit
axon
axon terminal
neurotransmitter
one neuron and all skeletal muscles it stimulates and controls
long thread-like extension of the neuron
branching ends of the axon that attach to the sarcolemma
chemical
motor unit
one neuron and all skeletal muscles it stimulates and controls
axon
long thread-like extension of the neuron
10 terms
Muscle Contraction
1
2
3
4
at the neuromuscular synapse Ach released by the synaptic ter…
the resulting change in the transmembrane potential of the mu…
the sarcoplasm reticulum releases stored calcium ions, increa…
calcium ions bind to troponin, producing a change in the orie…
1
at the neuromuscular synapse Ach released by the synaptic ter…
2
the resulting change in the transmembrane potential of the mu…
16 terms
Muscle Contraction
Step 1
Step 2
Step 3
Step 4
Electrical stimulus from brain/spinal cord reaches end of axon
Acetylcholine released into synaptic cleft
Acetylcholine diffuses across synaptic cleft and binds to rec…
Stimulates a muscle impulse which passes in all directions ov…
Step 1
Electrical stimulus from brain/spinal cord reaches end of axon
Step 2
Acetylcholine released into synaptic cleft
Muscle Contraction
Isometric
Isotonic
2 types of isotonic contractions
Eccentric contractions
Muscle contracts but does not cause any movement
Muscle contracts and there is movement
Concentric & eccentric
Muscle contracts and the distance between the origin and inse…
Isometric
Muscle contracts but does not cause any movement
Isotonic
Muscle contracts and there is movement
14 terms
MUSCLE CONTRACTION
sliding filament theory
action potential
synapse
acetylcholine
theory that explains how muscle contraction works; thin filam…
an electrical event that travels along a nerve fiber or muscl…
region where communication occurs between two neurons or neur…
neurotransmitter that communicates with the muscle fiber
sliding filament theory
theory that explains how muscle contraction works; thin filam…
action potential
an electrical event that travels along a nerve fiber or muscl…
Muscle contraction
Step 1
Step 2
Step 3
Step 4
Stimulation by motor neuron of the muscle fibers
Motor neuron stimulates the muscle through the NMJ, then acet…
Impulses travel down the SR and down the T tubules.
SR then releases Ca ions.
Step 1
Stimulation by motor neuron of the muscle fibers
Step 2
Motor neuron stimulates the muscle through the NMJ, then acet…
39 terms
Muscle Contraction
Perimysium
Epimysium
Sarcomere
Fiber
Connective tissue surrounding the fascicle (surrounds 10-100…
Just deep to the deep fascia (The layer of CT that surrounds…
Contractile unit of the muscle
a muscle cell
Perimysium
Connective tissue surrounding the fascicle (surrounds 10-100…
Epimysium
Just deep to the deep fascia (The layer of CT that surrounds…
Muscle Contraction
Isometric
Isotonic
Isokinetic
Concentric
no joint movement, muscle contraction (part/full) for muscle…
resistance the same throughout the entire motion, produces jo…
produces joint motion, muscle contraction (part or full), var…
muscle contraction where muscle fibers shorten during contrac…
Isometric
no joint movement, muscle contraction (part/full) for muscle…
Isotonic
resistance the same throughout the entire motion, produces jo…
7 terms
Muscle contraction
1
2
3
4
a neurotransmitted, acetylcholine, is made in the cytoplasm o…
when a nerve impulse reaches the end, vesicles releace acetyl…
protein receptors detect that acetylcholine and a muscle impu…
sarcoplasmic reticulum releases calcium into the muscle fiber
1
a neurotransmitted, acetylcholine, is made in the cytoplasm o…
2
when a nerve impulse reaches the end, vesicles releace acetyl…
Muscle contraction
1
2
3
4
Action potential arrives at the axon terminal
Calcium ions enter axon terminal
Acetylcholine is released into the synaptic cleft
Action potential initiated on sarcolemma
1
Action potential arrives at the axon terminal
2
Calcium ions enter axon terminal
Muscle Contraction
Step 1
Step 2
Step 3
Step 4
neurotransmitter released into the neuromuscular junction by…
acetylcholine diffuses across the neuromuscular junction and…
depolarization and action potential is generated
the action potential carried deep into the cell, causes the s…
Step 1
neurotransmitter released into the neuromuscular junction by…
Step 2
acetylcholine diffuses across the neuromuscular junction and…
14 terms
Muscle Contraction
sliding filament theory
action potential
synapse
acetylcholine
theory that actin filaments slide toward each other during mu…
A neural impulse; a brief electrical charge that travels down…
Location at which a neuron can transfer an impulse to another…
Neurotransmitter that produces an impulse in a muscle cell
sliding filament theory
theory that actin filaments slide toward each other during mu…
action potential
A neural impulse; a brief electrical charge that travels down…
Muscle Contraction
Acetylcholine is released into the neu…
Receptors on motor end plate receive a…
Ca+ released from sarcoplasmic reticul…
Ca+ attaches to troponin
1
2
3
4
Acetylcholine is released into the neu…
1
Receptors on motor end plate receive a…
2
Muscle contraction
Step 1
Step 2
Step 3
Step 4
An electrical impulse or action potential from the central ne…
Acetylcholine is a neurotransmitter released as the chemical…
The electrical impulse is propagated down the sarcolemma then…
Calcium is released from the SR and travels to the sarcoplasm…
Step 1
An electrical impulse or action potential from the central ne…
Step 2
Acetylcholine is a neurotransmitter released as the chemical…
15 terms
Muscle Contraction
Step 1
Step 2
Step 3
Step 4
an action potential travels down an axon towards the NMJ
voltage gated calcium channels in the axon terminal open
Calcium flows into the axon terminal
calcium in the axon terminal causes ACh to be secreted into t…
Step 1
an action potential travels down an axon towards the NMJ
Step 2
voltage gated calcium channels in the axon terminal open
13 terms
Muscle Contraction
1st
2nd
3rd
4th
signal from the brain
impulses reaches axon terminal
VG Ca channels open and Calcium flood AT
Calcium attaches to receptor vescicles
1st
signal from the brain
2nd
impulses reaches axon terminal
5 terms
Muscle contraction
Sarcomere
Actin
Myosin
Troponin
Muscle fiber subunit
Round protein in a muscle fiber
Long protein in a muscle finer
Muscle contractions regulator that binds to actin
Sarcomere
Muscle fiber subunit
Actin
Round protein in a muscle fiber
10 terms
Muscle Contraction
Fascle
Fiber
Myofibrils
Sacromere
Group of muscle fibers
Long muscle cell
Bundle of fibers
Smallest unit of muscle contraction
Fascle
Group of muscle fibers
Fiber
Long muscle cell
Muscle Contraction
muscle fiber
myofibrils
sacromeres
thick filaments
a single muscle cell
protein cables of overlapping filaments
the small contractile unit of a muscle fiber ... repeating group…
myosin
muscle fiber
a single muscle cell
myofibrils
protein cables of overlapping filaments
14 terms
Muscle Contraction
Sliding Filament Theory
Action Potential
Synapse
Acetylcholine
During contraction, the thin filaments slides over the thick…
A neural impulse; a brief electrical charge that travels down…
Location at which a neuron can transfer an impulse to another…
Neurotransmitter that produces an impulse in a muscle cell
Sliding Filament Theory
During contraction, the thin filaments slides over the thick…
Action Potential
A neural impulse; a brief electrical charge that travels down…
5 terms
Muscle Contraction
1.
2.
3.
4.
Muscle fibre stimulated
Ca2+ ions released
Thin filaments move to middle of Sarcomere
Muscle fibre contracts
1.
Muscle fibre stimulated
2.
Ca2+ ions released
12 terms
Muscle contraction
Actin
Myosin
Cross-bridge
Titin
Thin filament
Thick filament
Connection between myosin head and action
Attaches thick filaments to the z line
Actin
Thin filament
Myosin
Thick filament
14 terms
Muscle Contraction
step 1
step 2
step 3
step 4
neuron action potential arrives at the end of the motor neuro…
calcium causes synaptic vesicles to release ACh into synaptic…
ACh diffuses across cleft and binds Na receptors on sarcolemm…
Na flows across membrane
step 1
neuron action potential arrives at the end of the motor neuro…
step 2
calcium causes synaptic vesicles to release ACh into synaptic…
Muscle Contraction
Action Potential
Synapse
Acetylcholine
Troponin
Message from nerve; cannot jump from one cell to the other
Region where communication occurs between 2 neurons or neuron…
Neurotransmitter involved in muscle contraction
What binds to Ca2+ on actin filament
Action Potential
Message from nerve; cannot jump from one cell to the other
Synapse
Region where communication occurs between 2 neurons or neuron…
31 terms
muscle contraction
triad
cistern terminal
titin
M line
2 sarcoplasmic reticulum with terminal cistern in middle... - en…
terminal end of transverse tubule
filaments that connect myosin together... - through Z line... - sta…
membrane inside sarcomere that myosin penetrates... - stop myosi…
triad
2 sarcoplasmic reticulum with terminal cistern in middle... - en…
cistern terminal
terminal end of transverse tubule
16 terms
Muscle Contraction
Endomysium
Perimysium
Fascicle
Epimysium
is a wispy layer of areolar connective tissue that ensheaths…
the sheath of connective tissue surrounding a bundle of muscl…
a separately published installment of a book or other printed…
a sheath of fibrous elastic tissue surrounding a muscle.
Endomysium
is a wispy layer of areolar connective tissue that ensheaths…
Perimysium
the sheath of connective tissue surrounding a bundle of muscl…
Muscle Contraction
Step One
Step Two
Step Three
Step Four
Calcium stored inside the muscle cell is released as a result…
Calcium ions (Ca+2) bind to Troponin and Tropomyosin and alte…
The already energized Myosin head attaches to the active site…
The new ATP molecule attaches to the Myosin head
Step One
Calcium stored inside the muscle cell is released as a result…
Step Two
Calcium ions (Ca+2) bind to Troponin and Tropomyosin and alte…
Muscle contraction
1
2
3
4
Actin potential travels along the axon to a motor neuron caus…
ACh diffuses amd binds to the ACh reseptors on the sarcolemma…
The new action potential excites the sarcoplasmic reticulum (…
Ca binds with troponin causing it to change shape which pulls…
1
Actin potential travels along the axon to a motor neuron caus…
2
ACh diffuses amd binds to the ACh reseptors on the sarcolemma…
Muscle Contraction
Sensory Neurons
Motor Neurons
Step 1
Step 2 (The brain sends impulses (AP)…
Neurons that carry incoming information from the sensory rece…
Neurons that carry outgoing information from the brain and sp…
The brain sends impulses (AP) to the motor neurons
The AP travels down the Axon to the motor unit (all Motor uni…
Sensory Neurons
Neurons that carry incoming information from the sensory rece…
Motor Neurons
Neurons that carry outgoing information from the brain and sp…
Muscle contraction
Step one
Step two
Step three
Step four
Begin at neuromuscular junction, action potential travels alo…
Vesicles release the neurotransmitter acetylcholine (ach) int…
Ach binds to receptors on the motor end plate of the sarcolemma
Binding results in another action potential that travels thro…
Step one
Begin at neuromuscular junction, action potential travels alo…
Step two
Vesicles release the neurotransmitter acetylcholine (ach) int…
Muscle Contraction
neuron
motor neuron
Neuromuscular junction
Axon
a nerve cell
Carry impulses from the brain and spinal cord to muscles caus…
where a nerve fiber and a muscle fiber meet; the junction bet…
a nerve fiber that conducts a nerve impulse AWAY from a cell…
neuron
a nerve cell
motor neuron
Carry impulses from the brain and spinal cord to muscles caus…
17 terms
Muscle Contraction
ligament
antagonistic pair
flexion
extension
fibrous tissue that connects bone together
muscles that allow for opposite movement of limb typically ex…
movement that decreases the angle between two parts
movement that increases the angle between two parts
ligament
fibrous tissue that connects bone together
antagonistic pair
muscles that allow for opposite movement of limb typically ex…
Muscle contraction
1
2
3
4
Neurotransmitter ACh is released
Presence of neurotransmitter in sarcolemma : impulses to trav…
Calcium travel to myofibril:... Calcium binds to tropomyosin... Cau…
Myosin heads reach up and form cross bridges with actin
1
Neurotransmitter ACh is released
2
Presence of neurotransmitter in sarcolemma : impulses to trav…
10 terms
Muscle Contraction
1
2
3
4
Nervous impulse fires (to the axon terminals of a muscle neur…
ACh binds to receptors (after crossing the synapse to the sar…
Binding reaction causes action-potential (which spreads down…
ACh breaks down (quickly)
1
Nervous impulse fires (to the axon terminals of a muscle neur…
2
ACh binds to receptors (after crossing the synapse to the sar…
15 terms
Muscle Contraction
1
2
3
4
Action potential depolarizes synaptic terminal
Calcium channels open
Influx of calcium
Exocytosis of vesicles
1
Action potential depolarizes synaptic terminal
2
Calcium channels open
15 terms
Muscle Contraction
1
2
3
4
Nerve impulses arrives at the end of motor neuron
Acetylcholine (Ach) "neurotransmitters" is released - carried…
Ach binds to receptors on motor end plate
Sodium ions (Na+) rush into muscle fiber
1
Nerve impulses arrives at the end of motor neuron
2
Acetylcholine (Ach) "neurotransmitters" is released - carried…
12 terms
Muscle Contraction
Neuron action potential arrives at end…
ACH is released
ACH binds to receptors on motor end pl…
permeability of sacrolemma changes
...
...
...
...
Neuron action potential arrives at end…
...
ACH is released
...
Muscle Contraction
1. action potential
2. action potential reaches the axon t…
3. ACh diffuses across the synaptic cl…
4. sodium channels in sarcolemma carry…
...
...
...
...
1. action potential
...
2. action potential reaches the axon t…
...
10 terms
muscle contraction
an action potential is conducted down…
motor neuron terminal releases ach
ACh binds with receptors and opens sod…
calcium is released from the sarcoplas…
1
2
3
4
an action potential is conducted down…
1
motor neuron terminal releases ach
2
Muscle contraction
step 1
step 2
step 3
step 4
acetylcholine travels down the motor neuron and jumps that sy…
sodium ions are released
sodium excites the sacroplasmic reticulum which contains calc…
myosin heads attach to actin
step 1
acetylcholine travels down the motor neuron and jumps that sy…
step 2
sodium ions are released
12 terms
Muscle contraction
Step 1
Step 2
Step 3
Step 4
An electrical signal (action potential) travels down a nerve…
The neurotransmitter crosses the gap, binds to a protein (rec…
The action potential rapidly spreads along the muscle cell an…
The action potential opens gates in the muscle's calcium stor…
Step 1
An electrical signal (action potential) travels down a nerve…
Step 2
The neurotransmitter crosses the gap, binds to a protein (rec…
Muscle Contraction
Isometric
Concentric
Eccentric
Slow oxidative
no movement
produce force as muscle contracts
Force as muscle lengthens
endurance training ... Uses ATP... slow
Isometric
no movement
Concentric
produce force as muscle contracts
36 terms
Muscle Contraction
Neuromuscular junction
synaptic cleft
the outer surface of a resting muscle…
polarized definition
where the muscle and nerve that stimulates it meet or touch
gap between neuron and sarcolemma
polarized
the outside is positively charged and the inside is negativel…
Neuromuscular junction
where the muscle and nerve that stimulates it meet or touch
synaptic cleft
gap between neuron and sarcolemma
8 terms
Muscle Contraction
1
2
3
4
Acetylcholine is real eased form synaptic vessels, causing a…
Sarcoplasmic reticulum releases Ca2+
Ca2+ combine with troponin
tropomyosin threads are pulled away exposing binding sites
1
Acetylcholine is real eased form synaptic vessels, causing a…
2
Sarcoplasmic reticulum releases Ca2+
7 terms
muscle contraction
twitch contraction
Twitch summation
Tetanus
isometric contraction
single contraction... single action potential... weak contraction…
sustained elevation of cystolic calcium ... a lot of action pote…
muscle fibre stimulated rapidly= no chance to relax between s…
creates force without moving a load ... muscle is prevented from…
twitch contraction
single contraction... single action potential... weak contraction…
Twitch summation
sustained elevation of cystolic calcium ... a lot of action pote…
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