Biology 2401 Final Exam Questions | 2026/2027 | Answers
Correct | With Complete Solutions
63) The Sliding Filament Theory of muscle contraction states
that myofibers shorten when:
a. myosin heads rotate when they attach to actin, causing the
myosin filaments to fold in the middle.
b. actin filaments become shorter when they combine with
myosin heads.
c. acetylcholine reduces the friction between thin and thick
filaments, so they slide over each other more easily.
d. a neurotransmitter alters the arrangement of collagen fibers in
the endomysium, causing it to shrink more tightly
around the myofiber.
e. thin filaments are pulled toward the center of the sarcomere
by swiveling of the myosin heads. Correct Answers thin
filaments are pulled toward the center of the sarcomere by
swiveling of the myosin heads.
64) Which of the following statements are true regarding muscle
tissue? (Mark all that apply)
a. Skeletal muscle is involuntary.
b. Elasticity is the ability of a muscle to be stretched or
extended.
c. Cardiac muscle tissue is found in the wall of blood vessels in
the cardiovascular system.
d. Cardiac fibers are seperated by intercalated discs.
e. Smooth muscle cells are unstriated because they lack actin
and myosin filaments. Correct Answers d
65) Which of the following statements is INCORRECT?
,a. The contractions of skeletal muscles pull on tendons and
move bones of the skeleton.
b. Skeletal muscles are responsible for controlling the openings
of the digestive and urinary tracts.
c. Skeletal muscles are responsible for the pumping action of the
heart.
d. Skeletal muscles support the weight of some internal organs.
e. Skeletal muscle contractions help maintain body temperature.
Correct Answers b
c
d
66) The bundle of collagen fibers at the end of a skeletal muscle
that attaches the muscle to bone is called a(n):
a. fascicle. b. tendon. c. ligament. d. epimysium. e . myofibril.
Correct Answers tendon
67) Which of the following does not move the shoulder girdle?
a. pectoralis major b. biceps femoris c. rhomboid d. serratus
anterior e. trapezius Correct Answers pectoralis major
68) During the recovery period the body's need for oxygen is
increased because:
a. muscle cells are producing energy anaerobically. d. the
individual is panting.
b. the liver requires more oxygen to produce lactic acid. e. the
muscles are not producing ATP.
c. additional oxygen is required to metabolize the lactic acid
produced during exercise. Correct Answers c
69) Creatine phosphate:
, a. is produced by the process of anaerobic respiration.
b. can replace ATP in binding to myosin molecules during
contraction.
c. acts as an energy reserve in muscle tissue.
d. is only formed during strenuous exercise.
e. cannot transfer its phosphate group to ADP. Correct Answers
c
70) Which of the following statements are true? (mark all that
apply)
a. Muscular dystrophy is caused by an excess of acetylcholine
production at the neuromuscular junction.
b. Communication between nerve and muscle fiber occurs at
specialized junctions called neuromuscular junctions.
c. Satellite cells are scattered between muscle fibers and
function in the repair of damaged muscle tissue.
d. Botulinum toxin prevents the exocytosis of acetylcholine
from the synaptic vesicles at the NMJ thus preventing
muscle contraction.
e. Rigor mortis is a transient state of muscle rigidity that occurs
shortly after death. Correct Answers b
71) All of the following muscles are located on the back
EXCEPT
a. Latissimus dorsi b. Trapezius c. Teres major d. Pectoralis
major e. Infraspinatus Correct Answers d
72) Abdominal wall muscles, from superficial to deep:
1) Transversus abdominis
2) External oblique
3) Internal oblique
Correct | With Complete Solutions
63) The Sliding Filament Theory of muscle contraction states
that myofibers shorten when:
a. myosin heads rotate when they attach to actin, causing the
myosin filaments to fold in the middle.
b. actin filaments become shorter when they combine with
myosin heads.
c. acetylcholine reduces the friction between thin and thick
filaments, so they slide over each other more easily.
d. a neurotransmitter alters the arrangement of collagen fibers in
the endomysium, causing it to shrink more tightly
around the myofiber.
e. thin filaments are pulled toward the center of the sarcomere
by swiveling of the myosin heads. Correct Answers thin
filaments are pulled toward the center of the sarcomere by
swiveling of the myosin heads.
64) Which of the following statements are true regarding muscle
tissue? (Mark all that apply)
a. Skeletal muscle is involuntary.
b. Elasticity is the ability of a muscle to be stretched or
extended.
c. Cardiac muscle tissue is found in the wall of blood vessels in
the cardiovascular system.
d. Cardiac fibers are seperated by intercalated discs.
e. Smooth muscle cells are unstriated because they lack actin
and myosin filaments. Correct Answers d
65) Which of the following statements is INCORRECT?
,a. The contractions of skeletal muscles pull on tendons and
move bones of the skeleton.
b. Skeletal muscles are responsible for controlling the openings
of the digestive and urinary tracts.
c. Skeletal muscles are responsible for the pumping action of the
heart.
d. Skeletal muscles support the weight of some internal organs.
e. Skeletal muscle contractions help maintain body temperature.
Correct Answers b
c
d
66) The bundle of collagen fibers at the end of a skeletal muscle
that attaches the muscle to bone is called a(n):
a. fascicle. b. tendon. c. ligament. d. epimysium. e . myofibril.
Correct Answers tendon
67) Which of the following does not move the shoulder girdle?
a. pectoralis major b. biceps femoris c. rhomboid d. serratus
anterior e. trapezius Correct Answers pectoralis major
68) During the recovery period the body's need for oxygen is
increased because:
a. muscle cells are producing energy anaerobically. d. the
individual is panting.
b. the liver requires more oxygen to produce lactic acid. e. the
muscles are not producing ATP.
c. additional oxygen is required to metabolize the lactic acid
produced during exercise. Correct Answers c
69) Creatine phosphate:
, a. is produced by the process of anaerobic respiration.
b. can replace ATP in binding to myosin molecules during
contraction.
c. acts as an energy reserve in muscle tissue.
d. is only formed during strenuous exercise.
e. cannot transfer its phosphate group to ADP. Correct Answers
c
70) Which of the following statements are true? (mark all that
apply)
a. Muscular dystrophy is caused by an excess of acetylcholine
production at the neuromuscular junction.
b. Communication between nerve and muscle fiber occurs at
specialized junctions called neuromuscular junctions.
c. Satellite cells are scattered between muscle fibers and
function in the repair of damaged muscle tissue.
d. Botulinum toxin prevents the exocytosis of acetylcholine
from the synaptic vesicles at the NMJ thus preventing
muscle contraction.
e. Rigor mortis is a transient state of muscle rigidity that occurs
shortly after death. Correct Answers b
71) All of the following muscles are located on the back
EXCEPT
a. Latissimus dorsi b. Trapezius c. Teres major d. Pectoralis
major e. Infraspinatus Correct Answers d
72) Abdominal wall muscles, from superficial to deep:
1) Transversus abdominis
2) External oblique
3) Internal oblique
