BIOL 2401 Exam 4 Review Questions | 2026/2027 | Answers
Correct | With Complete Solutions
a group of muscle fibers that are encased in the perimysium are
called ____. Correct Answers Fascicle
A patient takes a medication that blocks ACh receptors of
skeletal muscle fiber. What is the drugs effects on skeletal
muscle contraction? Correct Answers Reduces the muscles
ability for contraction
A resting muscle generates most of its ATP by... Correct
Answers Aerobic metabolism of fatty acids
A single motor neuron together with all the muscle fibers it
innervates is called... Correct Answers a motor unit
Active site on the actin become available for binding when...
Correct Answers calcium binds to troponin.
After death, muscle fibers run out of ATP and calcium begins to
leak from the sarcoplasmic reticulum into the sarcoplasm. This
results in a condition known as... Correct Answers Rigor mortis
At each end of the muscle, the collagen fibers of the epimysium,
and each perimysium, and endomysium come together and form
a _____. Correct Answers tendon
At rest, active sites on the actin are blocked by ____. Correct
Answers Tropomyosin molecules
, At rest, the tropomyosin molecule is held in place by _____.
Correct Answers Troponin Molecules
Each skeletal muscle fiber is controlled by a neuron at a single
_____. Correct Answers neuromuscular junction
How would a drug that competes with, or mimics, ACh for
receptors at the motor end plate affect the skeletal muscle?
Correct Answers In small doses it would stimulate the muscle
fiber the same as ACh. In large doses it would cause a spastic
paralysis and the muscle would not be able to relax.
(Both B and C)
How would blocking the activity of acetylcholinesterase affect
skeletal muscle? Correct Answers It would cause spastic
paralysis (muscles unable to relax)
In a sarcomere, cross-bridge attachment occurs specifically in
the ____. Correct Answers Zone of overlaps
In an _____ contraction, tensions rises and the skeletal muscle
length stays the same. Correct Answers isotonic
in response to action potentials arriving along the transverse
tubules, the S.R. releases ______ ions. Correct Answers
Calcium
Interactions between actin and myosin filaments of the
sarcomere are responsible for _______. Correct Answers
muscle contraction
Correct | With Complete Solutions
a group of muscle fibers that are encased in the perimysium are
called ____. Correct Answers Fascicle
A patient takes a medication that blocks ACh receptors of
skeletal muscle fiber. What is the drugs effects on skeletal
muscle contraction? Correct Answers Reduces the muscles
ability for contraction
A resting muscle generates most of its ATP by... Correct
Answers Aerobic metabolism of fatty acids
A single motor neuron together with all the muscle fibers it
innervates is called... Correct Answers a motor unit
Active site on the actin become available for binding when...
Correct Answers calcium binds to troponin.
After death, muscle fibers run out of ATP and calcium begins to
leak from the sarcoplasmic reticulum into the sarcoplasm. This
results in a condition known as... Correct Answers Rigor mortis
At each end of the muscle, the collagen fibers of the epimysium,
and each perimysium, and endomysium come together and form
a _____. Correct Answers tendon
At rest, active sites on the actin are blocked by ____. Correct
Answers Tropomyosin molecules
, At rest, the tropomyosin molecule is held in place by _____.
Correct Answers Troponin Molecules
Each skeletal muscle fiber is controlled by a neuron at a single
_____. Correct Answers neuromuscular junction
How would a drug that competes with, or mimics, ACh for
receptors at the motor end plate affect the skeletal muscle?
Correct Answers In small doses it would stimulate the muscle
fiber the same as ACh. In large doses it would cause a spastic
paralysis and the muscle would not be able to relax.
(Both B and C)
How would blocking the activity of acetylcholinesterase affect
skeletal muscle? Correct Answers It would cause spastic
paralysis (muscles unable to relax)
In a sarcomere, cross-bridge attachment occurs specifically in
the ____. Correct Answers Zone of overlaps
In an _____ contraction, tensions rises and the skeletal muscle
length stays the same. Correct Answers isotonic
in response to action potentials arriving along the transverse
tubules, the S.R. releases ______ ions. Correct Answers
Calcium
Interactions between actin and myosin filaments of the
sarcomere are responsible for _______. Correct Answers
muscle contraction
