7.3 Muscle Physiology Exam Questions
and Answers
Excitability of skeletal muscle results from the release of which neurotransmitter at the
neuromuscular junction? - ANS-Acetylcholine
What is caused by myosin heads being unable to release from actin filaments because
of a lack of ATP? - ANS-Rigor mortis
In order for the troponin-tropomyosin complex to move, is required. - ANS-Ca
Which of the following is true regarding the Catt involved in skeletal muscle contraction?
- ANS-is released from the sarcoplasmic reticulum.
What is contained in the synaptic vesicles in the neuromuscular junctions? - ANS-
Acetylcholine
How is acetylcholine released from the presynaptic terminal? - ANS-Exocytosis
During excitation contraction coupling - ANS-Myosin heads bind to the exposed active
actin sites
Why does rigor mortis occur after death? - ANS-Because cross-bridges form but can't
release
Neurotransmitters, like acetylcholine, are stored in vesicles in the - ANS-axon terminals
Calcium is important in skeletal muscle contraction because it - ANS-causes the
troponin and tropomyosin molecules to expose the active sites on actin
ATP has just been hydrolyzed to ADP and phosphate. What stage of the cross-bridge
cycle is the sarcomere at? - ANS-Recovery stroke or "cocked
Calcium binds to allowing to move away from the active sites on the actin myofilaments.
- ANS-troponin, tropomyosin
If a person had a slight genetic mutation that disrupted the production of the enzyme
acetylcholinesterase what would be the difference at the neuromuscular junction? -
ANS-Increased number of action potentials
and Answers
Excitability of skeletal muscle results from the release of which neurotransmitter at the
neuromuscular junction? - ANS-Acetylcholine
What is caused by myosin heads being unable to release from actin filaments because
of a lack of ATP? - ANS-Rigor mortis
In order for the troponin-tropomyosin complex to move, is required. - ANS-Ca
Which of the following is true regarding the Catt involved in skeletal muscle contraction?
- ANS-is released from the sarcoplasmic reticulum.
What is contained in the synaptic vesicles in the neuromuscular junctions? - ANS-
Acetylcholine
How is acetylcholine released from the presynaptic terminal? - ANS-Exocytosis
During excitation contraction coupling - ANS-Myosin heads bind to the exposed active
actin sites
Why does rigor mortis occur after death? - ANS-Because cross-bridges form but can't
release
Neurotransmitters, like acetylcholine, are stored in vesicles in the - ANS-axon terminals
Calcium is important in skeletal muscle contraction because it - ANS-causes the
troponin and tropomyosin molecules to expose the active sites on actin
ATP has just been hydrolyzed to ADP and phosphate. What stage of the cross-bridge
cycle is the sarcomere at? - ANS-Recovery stroke or "cocked
Calcium binds to allowing to move away from the active sites on the actin myofilaments.
- ANS-troponin, tropomyosin
If a person had a slight genetic mutation that disrupted the production of the enzyme
acetylcholinesterase what would be the difference at the neuromuscular junction? -
ANS-Increased number of action potentials
