UNLV KIN 223 EXAM 4 QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
The characteristic of muscle that allows it to be passively stretched is - ANS extensibility.
Which are possible functions of skeletal muscles? - ANS Maintenance of posture.b: Both
highly coordinated and localized simple movements.c: Temperature regulation.d: Support of
certain body organs.e: Regulation of the movement of material through certain body tracts.
One feature that helps provide fast energy to a muscle cell is the presence of granules
containing the complex carbohydrate - ANS glycogen.
nvaginations of the muscle cell membrane that extend deep into the cell are known as the -
ANS T-tubules.
A motor unit consists of - ANS a single motor neuron and the multiple muscle fibers it
controls.
Which letter is associated with the light band and contains thin filaments only? - ANS I
The multiple nuclei in skeletal muscle cells are the result of the - ANS fusion of myoblasts.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, For relaxation to occur, - ANS sarcoplasm calcium levels fall, calcium is removed from
troponin, and tropomyosin blocks binding sites on actin.
Which is the neurotransmitter that causes the release of calcium ions from reservoirs within the
muscle cell and thereby initiates the steps of contraction? - ANS Acetylcholine
An end plate potential is an event that involves a gain of - ANS positive charge along the
inside of the cell membrane, as sodium rapidly enters.
Glycolysis is an - ANS anaerobic process that occurs in the cytosol.
"Intermediate fiber" is another name for - ANS a fast-twitch, oxidative fiber.
The type of fibers specialized to continue contracting for extended periods of time, as would be
required in running a marathon, for example, are _____ fibers. - ANS slow-twitch
n a lab, wave summation is demonstrated by increasing the _________ of the stimulus. -
ANS frequency
Events of excitation contraction coupling, such as the release of calcium from intracellular
stores, occur during the ________ period of a muscle twitch. - ANS latent
One of the reasons you might struggle to lift a heavy object with your arm fully extended is
because - ANS full extension results in decreased overlap between thick and thin filaments in
the muscle.
Lifting weights will cause muscles to enlarge. This is primarily due to - ANS an increase in the
size of muscle cells.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ANSWERS GRADED A+ 2025/2026
The characteristic of muscle that allows it to be passively stretched is - ANS extensibility.
Which are possible functions of skeletal muscles? - ANS Maintenance of posture.b: Both
highly coordinated and localized simple movements.c: Temperature regulation.d: Support of
certain body organs.e: Regulation of the movement of material through certain body tracts.
One feature that helps provide fast energy to a muscle cell is the presence of granules
containing the complex carbohydrate - ANS glycogen.
nvaginations of the muscle cell membrane that extend deep into the cell are known as the -
ANS T-tubules.
A motor unit consists of - ANS a single motor neuron and the multiple muscle fibers it
controls.
Which letter is associated with the light band and contains thin filaments only? - ANS I
The multiple nuclei in skeletal muscle cells are the result of the - ANS fusion of myoblasts.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, For relaxation to occur, - ANS sarcoplasm calcium levels fall, calcium is removed from
troponin, and tropomyosin blocks binding sites on actin.
Which is the neurotransmitter that causes the release of calcium ions from reservoirs within the
muscle cell and thereby initiates the steps of contraction? - ANS Acetylcholine
An end plate potential is an event that involves a gain of - ANS positive charge along the
inside of the cell membrane, as sodium rapidly enters.
Glycolysis is an - ANS anaerobic process that occurs in the cytosol.
"Intermediate fiber" is another name for - ANS a fast-twitch, oxidative fiber.
The type of fibers specialized to continue contracting for extended periods of time, as would be
required in running a marathon, for example, are _____ fibers. - ANS slow-twitch
n a lab, wave summation is demonstrated by increasing the _________ of the stimulus. -
ANS frequency
Events of excitation contraction coupling, such as the release of calcium from intracellular
stores, occur during the ________ period of a muscle twitch. - ANS latent
One of the reasons you might struggle to lift a heavy object with your arm fully extended is
because - ANS full extension results in decreased overlap between thick and thin filaments in
the muscle.
Lifting weights will cause muscles to enlarge. This is primarily due to - ANS an increase in the
size of muscle cells.
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
