LP3 Quiz Questions

Muscle cells 1 can only contract. 2 actively lengthen. 3 generate compression. 4 possess a mechanism that regulates the tension amount by changing the number of contracting sarcomeres. 6 vary tension production based on the amount of sodium ions bound to actin.

1

Which statement regarding skeletal muscle is true? 1 Skeletal muscles do not maintain body temperature. 2 Skeletal muscles are directly, but not indirectly, attached to bones. 3 Skeletal muscles contain blood vessels. 4 Skeletal muscles do not contain nervous tissue. 5 Skeletal muscles do not contain connective tissue.

1

A person whose genetic makeup makes him or her a better marathon runner than a sprinter probably has more ________ in his or her leg muscles. 1 dark fibers 2 slow fibers 3 intermediate fibers 4 red fibers 5 fast fibers

2

Rigor mortis occurs at death due to a lack of 1 RNA. 2 ATP. 3 cAMP. 4 DNA. 5 tRNA.

2

Smooth muscle cells 1 are innervated by motor neurons. 2 are spindle-shaped. 3 contain intercalated discs. 4 are larger than cardiac muscle cells. 5 are multinucleate.

2

After death, rigor mortis lasts until 1 sarcomeres lengthen. 2 sodium ions are released by the sarcoplasmic reticulum. 3 myofilaments are broken down. 4 ATP is produced. 5 T-tubules recapture calcium ions.

3

Which of the following occurs when tension production rises to a peak and very brief periods of relaxation occur? 1 complete tetanus 2 tension plateau 3 incomplete tetanus 4 resting period 5 latency

3

Nonstriated, involuntary muscle is 1 intermediate skeletal. 2 cardiac. 3 red skeletal. 4 smooth. 5 white skeletal.

4

The muscle that adducts and medially rotates the shoulder is the 1 trapezius. 2 deltoid. 3 teres minor. 4 teres major. 5 infraspinatus.

4

The specialized sarcolemma that contains acetylcholine receptors is the 1 I band. 2 synaptic cleft. 3 synaptic knob. 4 motor unit. 5 motor end plate.

5