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kms

tendon

the dense connective tissue that attaches muscle to bone is..

nuclei

the advantage of having many ____ in a skeletal muscle fiber is to produce large amounts of enzymes and structural proteins needed for contraction.

myofibrils

The following describes:

• Attached to cell membrane ate both end of muscle fiber

• Extend the length of skeletal muscle fiber

• Hundreds of thousands are found in skeletal muscle fiber

• 1-2 microns in diameter

t-tubules

the command to contract is distributed into the depth of a muscle fiber by the..?

terminal cisternae

on either side of transverse tubule & the individual tubules of the sarcoplasmic reticulum and form expanded chambers called..?

skeletal muscles

The following describes____

• Helps maintain body temperature

• Support the weight of some internal organs

• Pull on tendons

• Responsible for guarding openings of digestive and urinary tracts.

action potential

the conducted charge in the transmembrane potential is called the..?

troponin

active site exposure during the contraction process occurs when calcium binds to____.

rigor mortis

after death. muscle fibers run out of ATP and calcium leaks from the sarcoplasmic reticulum. This causes a condition called?

tetanus neurotoxin

spastic paralysis is caused by the blocking activity of..?

neuromuscular junctions

communications between nerve and muscle fibers occur at specialized areas called..?

neuromuscular joint (motor end plate)

each skeletal muscle fiber is controlled by neurons at a single...?

synaptic cleft

the space between the neuron and the muscle is the..?

motor end plate

the area of the muscle fiber that contains receptors for acetylcholine is the..?

depolarization

when acetylcholine opens gates go receptors on the motor end plate... ____ of the motor end plate occurs.

sliding filament theory

the theory that explains how a muscle fiber contracts is called the...?

cross bridges

because they connect thick and thin filament.. the myosin heads are also known as..?

z - lines

physical evidence that supports the sliding filament theory of muscle contraction includes decreased distance between______ during contraction.

center of the sacromere

When myosin cross bridges bind to the active sites on actin they pivot toward the..?

tetanus

the toxin that causes _____ probably acts by making the cell membranes more permeable to calcium ions.

actin and myosin actively pushing away from one another

during relaxation, muscles return to their original length because of all the following EXCEPT
the pull of gravity
the contraction of opposing muscles
the elastic nature of the sarcolemma
actin and myosin actively pushing away from one another
elastic forces

t-tubules

action potentials are conducted into a skeletal muscle fiber by..?

calcium ions

in response to action potentials arriving from transverse tubules.. the sarcoplasmic reticulum releases...?

myosin head

______ acts as an ATPase during the contraction cycle of muscle.

excitation-contraction coupling

the sequence of events which forms the link between electrical activity in the sarcolemma and the initiation of contraction is called..?

Fasicles

bundles of muscle fibers are called

Epimysium

the dense layer of collagen fibers that surround an entire muscle is

sarcoplasm

the cytoplasm of the skeletal muscle fiber is called

myosin

cross-bridges are portions of ____ molecules

sarcomere

the functional unit of a skeletal muscle fiber is the

Satellite cells

___ scattered between the endomysium and muscle fibers function in the repair of damaged muscle cells

perimysium

nerves and blood vessels that service the muscle fibers are located in the connective tissues of the___

sarcolemma

the cell membrane of skeletal muscle is called the ____

H-zone

the area in the center of the A band that contains only thick filaments

myofibrils

each skeletal muscle fiber contains hundreds to thousands of

a-band

the area of the sarcomere containing both thin and thick filaments

endomysium

the delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together

I-band

the area of the sarcomere that contains only thin filaments

tropomyosin

at rest.. active sites on the actin are blocked by ____ molecule