Muscle Physiology Pt. 1 Exam Questions
and Answers Graded A+
voltage sensitive integral proteins? - Correct answer-Sarcolema and T-tubules
How many neuromuscular junctions does an individual skeletal muscle fiber have?
- Correct answer-one
Which channel type responds to changes in membrane potential? - Correct answer-
voltage gated
1. A channels in the axon terminal open
2. Acetylcholine is released by exocytosis
3. An action potential travels down the axon of a motor neuron
4.Myosin heads bind to actin
Which of the following is not part of the process whereby a skeletal muscle fiber is
stimulated by a motor neuron? - Correct answer-Myosin heads bind to actin
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, Muscle and nerve cells are excitable meaning ___________. - Correct answer-
They can receive and respond to stimuli AND Their resting membrane potential
can change
In a skeletal muscle fiber, the depolarization phase of an action potential is due
to___________. - Correct answer-Na+ influx into the intracellular fluid
Components of a triad? - Correct answer-2 terminal cisterna and a t-tubule
The functional unit of a skeletal muscles is a - Correct answer-sarcomere
The component of myofibrils that acts as an anchor for THIN filaments (actin) is
called the - Correct answer-z-line (disc)
A 3 polypeptide subunit complex, this molecule is located on THIN myofilaments -
Correct answer-troponin (actin, Ca2+, tropmyosin)
Which is false regarding the contraction of skeletal muscles? - Correct answer-A
bands shorten
During skeletal muscle fiber excitation, whats released from synaptic vesicles
within the axon terminal and travels across the synaptic cleft? - Correct answer-
ACh (neurotransmitter, NT)
Which correctly describes the sliding filament model of contraction? - Correct
answer-Cross bridges form when myosin heads bind to ACTIN, Cross bridges are
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
and Answers Graded A+
voltage sensitive integral proteins? - Correct answer-Sarcolema and T-tubules
How many neuromuscular junctions does an individual skeletal muscle fiber have?
- Correct answer-one
Which channel type responds to changes in membrane potential? - Correct answer-
voltage gated
1. A channels in the axon terminal open
2. Acetylcholine is released by exocytosis
3. An action potential travels down the axon of a motor neuron
4.Myosin heads bind to actin
Which of the following is not part of the process whereby a skeletal muscle fiber is
stimulated by a motor neuron? - Correct answer-Myosin heads bind to actin
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
, Muscle and nerve cells are excitable meaning ___________. - Correct answer-
They can receive and respond to stimuli AND Their resting membrane potential
can change
In a skeletal muscle fiber, the depolarization phase of an action potential is due
to___________. - Correct answer-Na+ influx into the intracellular fluid
Components of a triad? - Correct answer-2 terminal cisterna and a t-tubule
The functional unit of a skeletal muscles is a - Correct answer-sarcomere
The component of myofibrils that acts as an anchor for THIN filaments (actin) is
called the - Correct answer-z-line (disc)
A 3 polypeptide subunit complex, this molecule is located on THIN myofilaments -
Correct answer-troponin (actin, Ca2+, tropmyosin)
Which is false regarding the contraction of skeletal muscles? - Correct answer-A
bands shorten
During skeletal muscle fiber excitation, whats released from synaptic vesicles
within the axon terminal and travels across the synaptic cleft? - Correct answer-
ACh (neurotransmitter, NT)
Which correctly describes the sliding filament model of contraction? - Correct
answer-Cross bridges form when myosin heads bind to ACTIN, Cross bridges are
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
