MUSCLES - PHYSIOLOGY BIOL 252
ACTUAL EXAM 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
Which muscle type is voluntary and responds to
somatic motor neurons?
a. Skeletal
b. Cardiac
c. Smooth
d. Visceral
b. Cardiac
Which muscle type is involuntary and responds to
autonomic motor neurons?
a. Skeletal
b. Cardiac
,c. Smooth
d. Visceral
b. Smooth
Explanation: Smooth muscle lines internal organs and
controls the movement of materials.
Primary muscle of internal organs and tubes is
______.
a. Cardiac
b. Smooth
c. Skeletal
d. Striated
b. Sarcolemma
Explanation: Sarcolemma is the specialized cell
membrane of a muscle fiber.
The plasma membrane of a muscle fiber is called
the _____.
a. Sarcoplasm
b. Sarcolemma
,c. Sarcomere
d. Sarcoplasmic reticulum
d. Sarcoplasmic reticulum
Explanation: Terminal cisternae of the sarcoplasmic
reticulum sequester Ca²⁺.
Which structure stores and releases calcium for
contraction?
a. Sarcoplasm
b. Sarcolemma reticulum
c. Sarcomere
d. Sarcoplasmic reticulum
b. One T-tubule + two terminal cisternae
Explanation: The triad allows action potentials to
reach deep within the fiber.
A triad consists of _____.
a. Two T-tubules + one terminal cisterna
b. One T-tubule + two terminal cisternae
, c. Three mitochondria
d. Three myofibrils
a. muscle, fascicle, muscle fiber, myofibril,
sarcomere
Explanation: Bundling follows that hierarchy.
Correct order largest→smallest: muscle, fascicle,
muscle fiber, myofibril, sarcomere.
a. muscle, fascicle, muscle fiber, myofibril, sarcomere
b. fascicle, muscle fiber, myofibril, muscle sarcomere
c. muscle fiber, muscle, fascicle, myofibril, sarcomere
d. muscle, fascicle, myofibril, muscle fiber, sarcomere
a. Sarcoplasm
Explanation: Sarcoplasm contains organelles and
glycogen granules.
The cytoplasm of a muscle fiber is the _____.
a. Sarcoplasm
b. Sarcolemma
ACTUAL EXAM 2025/2026 QUESTIONS
AND 100% CORRECT ANSWERS
Which muscle type is voluntary and responds to
somatic motor neurons?
a. Skeletal
b. Cardiac
c. Smooth
d. Visceral
b. Cardiac
Which muscle type is involuntary and responds to
autonomic motor neurons?
a. Skeletal
b. Cardiac
,c. Smooth
d. Visceral
b. Smooth
Explanation: Smooth muscle lines internal organs and
controls the movement of materials.
Primary muscle of internal organs and tubes is
______.
a. Cardiac
b. Smooth
c. Skeletal
d. Striated
b. Sarcolemma
Explanation: Sarcolemma is the specialized cell
membrane of a muscle fiber.
The plasma membrane of a muscle fiber is called
the _____.
a. Sarcoplasm
b. Sarcolemma
,c. Sarcomere
d. Sarcoplasmic reticulum
d. Sarcoplasmic reticulum
Explanation: Terminal cisternae of the sarcoplasmic
reticulum sequester Ca²⁺.
Which structure stores and releases calcium for
contraction?
a. Sarcoplasm
b. Sarcolemma reticulum
c. Sarcomere
d. Sarcoplasmic reticulum
b. One T-tubule + two terminal cisternae
Explanation: The triad allows action potentials to
reach deep within the fiber.
A triad consists of _____.
a. Two T-tubules + one terminal cisterna
b. One T-tubule + two terminal cisternae
, c. Three mitochondria
d. Three myofibrils
a. muscle, fascicle, muscle fiber, myofibril,
sarcomere
Explanation: Bundling follows that hierarchy.
Correct order largest→smallest: muscle, fascicle,
muscle fiber, myofibril, sarcomere.
a. muscle, fascicle, muscle fiber, myofibril, sarcomere
b. fascicle, muscle fiber, myofibril, muscle sarcomere
c. muscle fiber, muscle, fascicle, myofibril, sarcomere
d. muscle, fascicle, myofibril, muscle fiber, sarcomere
a. Sarcoplasm
Explanation: Sarcoplasm contains organelles and
glycogen granules.
The cytoplasm of a muscle fiber is the _____.
a. Sarcoplasm
b. Sarcolemma
