APHY 201 EXAM 1 QUESTIONS WITH VERIFIED
ANSWERS
All of the following terms refer to the ability to receive and respond to a stimulus
EXCEPT __________. - Answers - contractility
Increasing the length of a skeletal muscle prior to an isometric contraction: - Answers -
may either increase or decrease the force that can be developed, depending on the
length at which the muscle is originally held
Regarding skeletal muscles, it is true that: - Answers - during isometric contraction, the
muscle performs no mechanical work
Each skeletal muscle fiber is controlled by a neuron at a single __________. - Answers
- neuromuscular junction
The sequence of electrical changes that occurs along the sarcolemma when a muscle
fiber is stimulated is known as the __________. - Answers - action potential
Which of the following statements is false? - Answers - During contraction, thin
filaments slide past thick filaments so that actin and myosin filaments do not overlap.
A motor neuron along with all the muscle fibers it supplies is called a(n) __________. -
Answers - motor unit
During excitation-contraction coupling in skeletal muscle - Answers - Ca2+ is released
from the sarcoplasmic reticulum
Which of the following skeletal muscles have the highest ratio of motor nerve fibers to
skeletal muscles fibers (i.e., motor units of the lowest number) - Answers - flexor
muscles of the fingers
If a muscle is applied to a load that exceeds the muscle's maximum tension,
__________. - Answers - the muscle length will not change during contraction
When skeletal muscle isometrically contracts: - Answers - chemical energy is converted
into thermal energy (heat)
Which of the following does NOT occur during skeletal muscle contraction? - Answers -
Calcium binds to myosin heads.
When an action potential arrives at the neuromuscular junction, the most immediate
result is __________ - Answers - the depolarization of the sarcolemma
ANSWERS
All of the following terms refer to the ability to receive and respond to a stimulus
EXCEPT __________. - Answers - contractility
Increasing the length of a skeletal muscle prior to an isometric contraction: - Answers -
may either increase or decrease the force that can be developed, depending on the
length at which the muscle is originally held
Regarding skeletal muscles, it is true that: - Answers - during isometric contraction, the
muscle performs no mechanical work
Each skeletal muscle fiber is controlled by a neuron at a single __________. - Answers
- neuromuscular junction
The sequence of electrical changes that occurs along the sarcolemma when a muscle
fiber is stimulated is known as the __________. - Answers - action potential
Which of the following statements is false? - Answers - During contraction, thin
filaments slide past thick filaments so that actin and myosin filaments do not overlap.
A motor neuron along with all the muscle fibers it supplies is called a(n) __________. -
Answers - motor unit
During excitation-contraction coupling in skeletal muscle - Answers - Ca2+ is released
from the sarcoplasmic reticulum
Which of the following skeletal muscles have the highest ratio of motor nerve fibers to
skeletal muscles fibers (i.e., motor units of the lowest number) - Answers - flexor
muscles of the fingers
If a muscle is applied to a load that exceeds the muscle's maximum tension,
__________. - Answers - the muscle length will not change during contraction
When skeletal muscle isometrically contracts: - Answers - chemical energy is converted
into thermal energy (heat)
Which of the following does NOT occur during skeletal muscle contraction? - Answers -
Calcium binds to myosin heads.
When an action potential arrives at the neuromuscular junction, the most immediate
result is __________ - Answers - the depolarization of the sarcolemma
