Skeletal Structures and Functions
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Questions and Answers

Myofibrils contain:

  • Contractile proteins
  • Regulatory proteins
  • Structural proteins
  • All of these answers are correct. (correct)

Which of the following structures consists of a somatic motor neuron and all the skeletal muscle fibers it stimulates?

  • Neuromuscular junction
  • Sarcomere
  • Muscle unit
  • Motor unit (correct)

Increasing the number of active motor units within a skeletal muscle is called:

  • Wave summation.
  • Muscle tone.
  • Motor unit recruitment. (correct)
  • Flaccidity.

Which of following is a common characteristic of fast glycolytic (FG) skeletal muscle fibers?

<p>High amount of glycogen in the sarcoplasm (A)</p> Signup and view all the answers

Smooth muscle cells differ from skeletal and cardiac muscle cells in that:

<p>They can exhibit hyperplasia. (B)</p> Signup and view all the answers

Skeletal muscle cells are generally multinucleate because:

<p>They were formed by fusion of more than one cell. (D)</p> Signup and view all the answers

Which of the following proteins is used to reinforce the sarcolemma and to help transmit the tension generated by the sarcomeres to the tendons?

<p>Dystrophin (A)</p> Signup and view all the answers

Skeletal muscle contraction will continue to occur as long as which of the following chemicals are available in the cytosol of the muscle fiber?

<p>Calcium ions and ATP (D)</p> Signup and view all the answers

The benefit of the creatine phosphate is that:

<p>It can generate ATP for a short time even when oxygen is not present. (A)</p> Signup and view all the answers

If people are given an acetylcholinesterase inhibitor, they are likely to:

<p>Become very weak. (D)</p> Signup and view all the answers

Calcium is used to trigger cross-bridge formation during which phase of muscle contraction?

<p>Contraction phase (C)</p> Signup and view all the answers

While performing pull-ups, a person slowly lowers themselves from the "up" position. This is an example of:

<p>D. An eccentric isotonic contraction. (D)</p> Signup and view all the answers

Which of the following types of muscle tissue contract(s) when excited by its/their own autorhythmic muscle fibers?

<p>Cardiac muscle (D)</p> Signup and view all the answers

Which of the following correctly lists the sequence of structures that action potentials must move through to excite skeletal muscle contraction?

<p>Axon of neuron, sarcolemma, T tubules (D)</p> Signup and view all the answers

In skeletal muscles, the combined amounts of creatine phosphate and ATP provide enough energy for the muscle to contract maximally for approximately:

<p>15 seconds. (A)</p> Signup and view all the answers

To stimulate skeletal muscle contraction, acetylcholine must cross the __________ of the neuromuscular junction and bind to receptors on the motor end plate.

<p>Synaptic cleft (B)</p> Signup and view all the answers

Which is a correct sequence of events in the onset of rigor mortis?

<p>Cellular membranes become leaky -&gt; calcium ions leak into the sarcoplasm -&gt; myosin heads bind to actin -&gt; muscles are in a state of rigidity (C)</p> Signup and view all the answers

In a neuromuscular junction, the effect of acetylcholine (ACh) binding to receptors on the motor end plate lasts only briefly due to:

<p>Rapid destruction of ACh in the synaptic cleft by acetylcholinesterase (B)</p> Signup and view all the answers

Which of the following are commonly used to produce ATP during skeletal muscle contraction?

<p>All of these choices are correct (D)</p> Signup and view all the answers

Which of the following is also referred to as the period of lost excitability in skeletal muscle fibers?

<p>Refractory period (A)</p> Signup and view all the answers

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