Quiz #7 Bonin

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A single muscle contraction lasting a fraction of a second is called summation

False

Creatine Phosphate binds oxygen for use in making ATP and is stored in muscle tissue.

False

Myofibrils make up the microfilaments.

False

A neuromuscular junction is where a __ and a myofibril come together and connect. __ is released from the axon terminal and binds with a receptor on the __.

Neuron; acetylcholine; sarcolemma

Produces heat by ATP breakdown

Skeletal muscle

The greater the intensity of stimulation a muscle receives and the more motor units are activated in a muscle response are called:

recruitment

cell membrane

sarcolemma

excitable; carries an action potential

sarcolemma

cytoplasm

sarcoplasm

smooth endoplasmic reticulum

sarcoplasmic reticulum

stores Ca++

sarcoplasmic reticulum

voluntary

skeletal muscle

located in hollow organs of digestive tract

smooth muscle

no sarcomeres

smooth muscle

non-striated

smooth muscle

spindle-shaped

smooth muscle

Creatine Phosphate functions in the muscle cell by:

storing energy that will be transferred to ADP to resynthesize ATP

A tendon is an extension of the muscle's connective tissue. Tendons attach muscle to the surrounding muscle

first statement is true only

Which is not a function of skeletal muscles?

move food through our hollow organs

skeletal muscle

multi-nucleated

Another correct term for a muscle cell is:

muscle fiber

The striations in muscle tissue are caused by the "overlapping" of:

myofilaments

The __ molecule has two heads that resemble two golf clubs twisted around themselves. It binds to the exposed site on actin.

myosin

What are the three connective tissue classifications that divide muscle, cover it, and eventually all merge together to become fascia and tendons?

**(All of the above) endomysium, epimysium, perimysium

What is ATP used for in muscle contractions?

**(All of the above) myosin's "power stroke", release of myosin from actin after contraction, returns Ca++ to Sarcoplasmic reticulum

A sustained muscle contraction with no relaxation is called tetany.

True

intercalated discs

cardiac muscle

intrinsic nervous stimulation

cardiac muscle

What is the role of myoglobin in muscle contraction?

oxygen carrier for cellular respiration found in the muscle

Which of the following connective tissues surround a muscle fascicle?

perimysium

two SR cisternae and a T-Tubule

triad

The critical role Ca++ plays in muscle contractions is to bind with __ on actin, exposing a binding cite. The globular heads of __ can now cross-link with actin and ADP is released.

troponin; myosin


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