Muscle contraction

49 terms by sugarbobbin 

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anti

against

endo

within

fasc

bandage

glyco

sweet

iso

equal/measured

lysis

dissolution, loosening

multi

much, many

myo

muscle

mys

,muscle

peri

around

sarco

muscle/flesh

stabil

fixed

syn

together

tens/tone

streching

Cardiac Muscle

Located at the heart

Smooth Muscle

Located in the walls of hollow visceral organs and blood vesels

Skeletal Muscle

located in skeletal muscles

Striated Muscle

Appears striated or banded. Skeletal muscle tissue and cardiac muscle are both striated in appearance and smooth muscle is not.

Muscle contraction

...

What happens to the length of a muscle when it contracts?

it creates a pulling force on its attachments that attempts to pull them towards each other.

shortens

aka Concentric contractions, it shortens towards the center and is determined by the strength of the pulling force. It can go both ways, by generating force that increases action, or can be relaxed and shortened by another mover.

lengthens

aka eccentric contraction, if the force of the muscle is less than the resistance the muscle will lengthen instead of shorten. It can contract and lengthen, or relax and lenghen.

stays the same length

aka Isometric contractions

Fixed attachment

if an attachment doesn't move it's fixed.

Mobile attachment

If an attachment moves it is mobile.

Standard action

why/when does it occur?

Reverse action

the attachment that is usually fixed is now mobile and the attachment that is usually mobile is now fixed.

Name the location of the attachments

ex: proximal and distal, superior and inferior

Origin/Insertion

Origin: The point where a muscle attaches to the non-movable bone

Insertion: The other attachment site of the muscle that contracts into the origin.

fascicles

It is rare for muscle fivers to run the entire length of the muscle, usually they lay end to end or parallel and overlap. Thses fibers are organized in bundles known as fascicles.

myofibrils

are oriented within the cytoplasm running the entire length of the muscle fiver.

sarcomeres

myofibrils are composed of units called sarcomeres that are laid end to end from one end to another.

actin and myosin filaments

Actin filments are thin and myosin filaments are thick. Action are Z lines at both ends of the sacromeres and myosin are located in the center of the sacromere.

Sliding Filament Mechanism

Is how the sacromeres shorten, the actin and the myosin slide along each other. A message is sent from the nervous system to tell it to contract, the message causes the sarcoplasmic reticulum to release stored calcium into the sacroplasm. These calcium ions attach onto the actin.

Mover

The myscle that is concentrically contracting is called a mover.

Antagonist

is a muscle that can do the opposite action f the action in question

neutralizers

is a muscle that con stop unwanted action at the mobile attachement of the muscle that is working and work at insertion.

Stabilizer

A second muscle that contracts to fix a body part would be a fixator or stabilizer.

Coordination

is defined as the coordering od muscles in the body in their various roles to create smooth and efficent movement.

cencentric contraction

where the muscle contracts and shortens with joint action

eccentric contraction

when a muscle contracts and lengthens

isometric contraction

is where in the muscle contracts and stay the same length

joint action

1. the type of motion that has occured.
2. name of the body par that has moves
3. name of the joint where the movement has occured.

perimysium

fibrous fascia that surrounds a group of muscle fibers, dividing the muscle into bundles known as fascicles

epimysium

fibrous fascia that surrounds an entire muscle

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