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Practice Exam on Test 3

Authored by Ru Ru

Biology

University

Practice Exam on Test 3
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38 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The strongest muscle contractions are normally achieved by ________.

recruiting small and medium muscle fibers

increasing the stimulation up to the maximal stimulus

increasing stimulus above the threshold

increasing stimulus above the treppe stimulus

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a factor that affects the velocity and duration of muscle contraction?

number of muscle fibers stimulated

size of the muscle fibers stimulated

load on the fiber

muscle length

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Immediately following the arrival of the stimulus at a skeletal muscle cell, there is a short period called the ________ period, during which the neurotransmitter is released by exocytosis, diffuses across the synaptic cleft, and binds to its receptors.

latent

refractory

contraction

relaxation

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of wave summation?

produce smooth, continuous muscle contraction

prevent muscle fatigue

increase muscle tension

prevent muscle relaxation

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

During muscle contraction, myosin cross bridges attach to which active sites?

thick filaments

Z discs

myosin filaments

actin filaments

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Rigor mortis occurs because ________.

sodium ions leak into the muscle causing continued contractions

proteins are beginning to break down, thus preventing a flow of calcium ions

no ATP is available to release attached actin and myosin molecules

the cells are dead

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Sarcomeres are functional units of ________ muscle.

cardia

smooth

B and C only

skeletal

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