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51 terms

A&P Final part three

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An alternative term for a muscle cell is a
muscle fiber
Which muscle seperates the thoracic and the abdominopelvic cavities?
diaphram
An immovable joint found only between skull bones is called a
suture
In the classification of joints, which of the following is true
All synovial joins are freely movable.
Fibrous joints are classified as
sutures, syndesmosis, and gomphosis
In symphysis joints the articular surfaces of the bones are covered with
hyaline cartilage
Menisci refer to
semilunar cartilage pads
An example of an interosseus fibrous joint is
the radius and ulna along its length
Calcium ions bind to the _______ molecule in skeletal muscle cells.
troponin
Fibrous cartilage discs that provide cushioning in joints are called_______.
menesci
The movement of a body part superiorly is called_______.
elevation
In skeletal muscle contraction, calcium apparently acts to
remove the blocking action of tropomyosin.
An elaborate network of membranes in skeletal muscle cells that functions in calcium storage is the
sarcoplasmic reticulum
A sarcomere is
the area between two Z disks
Which of the following is composed of myosin
think filaments
The term aponeurosis refers to
a sheetlike indirect attachment to a skeletal element
The muscle cell membrane is called the
sarcolemma
After nervous stimulation stops, ACh in the synaptic cleft is prevented from continuing stimulation of contraction by
acetylcholinesterase destroying the Ach
The membranous areas between the cranial bones of the fetal skull are called
fontanels
The structural theory that explains how a muscle fiber contracts is called the _____ _____ ______.
sliding filament theory
The carilaginous parts that seperate vertabrae are called ______ ______.
intervertabral disks
The inferiormost part of the sternum is the ________
xiphoid process
A fracture in the shaft of the bone would be a break in the _____.
diaphysis
Electrical impulses reach the muscle cell's interior to alter the cell's chemical environment via what network?
transverse tubules
The smallest functional unit is the what? Interactions between its thick and thin filaments are responsible for muscle contractions.
sarcomere
_______ is the neurotransmitter or chemical released by a motor neuron to communicate with other cells.
acetylcholine
An _____ is a muscle whose contraction is chiefly responsible for producing a particular movement.
agonist
What is the central shaft of a long bone called?
diaphysis
The origin of a particular skeleton muscle is defined as
the attachment site to the less moveable bone.
The eight ____ bones make up the wrist.
carpal
The pelvic girdle is included in what division of the skeleton?
appendicular
Muscle fibers in skeletal muscles for bundles called ________?
fasicles
True ribs are directly connected to the sternum by _______ ______?
costal cartilage
As ATP binds to the myosin head at the beginning of a muscle contraction cycle,
the mysosin head detaches from the actin
What type of membrane wraps a fascicle
perimysium
A sarcomere is
the contractile unit between two Z discs
Place these structures of the skeletal muscle in order from largest to smallest
fascicle, muscle cell (fiber), myofibril, sarcomere, myofilament
Which of the following bones is not weight bearing?
Fibula
The axon terminals of a nerve cell and the sarcolemma of a skeletal muscle join at the
synaptic cleft
________ are cartilaginous joints.
synchondroses
The heel bone is called the ______?
calaneus
The smallest carpal is the ______?
pisiform
The mechanical force of contraction is generated by
The sliding of thin filaments past thick ones
The gap between the axon terminal of a motor neuron and the sarcolemma of a muscle cell is called the
synaptic cleft
Neurotransmitters are released upon stimulation from a nerve impulse by the
axon terminals of the motor neuron
While doing "jumping jacks" during an exercise class, your arms and legs move laterally away from the midline of your body. This motion is called
abduction
The I band contains
thin filaments
Atriculations permitting only slight degress of movement are
amphiarthroses
The H zone contains
thick filaments
The major function of the intervertabral discs is to
absorb shock
The sliding filament model of contraction involves
actin and myosin sliding past each other and partially overlap