Bio 161 Exam 4 REviEw Exam 2026 wiTH CoRRECT aCTUaL
QUESTioNS aND CoRRECTLY wELL DEFiNED aNSwERS LaTEST
aLREaDY GRaDED a+
muscle fiber - aNSwER-an individual muscle cell
fasicle - aNSwER-a group of muscle cells within the belly of a muscle
sarcolemma - aNSwER-plasma membrane of skeletal muscle cells
sarcoplasm - aNSwER-the cytoplasm of a skeletal muscle cell
sarcomere - aNSwER-Contractile unit of a muscle cell that make a myofibirl
sarcoplasmic reticulum - aNSwER-Modified endoplasmic reticulum that regulates
calcium in the cell
T (transverse) tubules - aNSwER-Tubes continuous with the sarcolemma to
increase surface area
myofibril - aNSwER-The major component of a muscle cell (takes up the most
intracellular volume)
myoglobin - aNSwER-Oxygen-binding protein in a muscle cell
multi nucleate - aNSwER-Containing many nuclei
, epimysium - aNSwER-Fibrous connective tissue that is continuous with the
tendon
Which type of muscle cell(s) is (are) striated? Choose all that apply. - aNSwER-
skeletal, cardiac
Skeletal muscle tends to contain short, branched cells. T or F? - aNSwER-False,
Skeletal muscle cells tend to be very long and cylindrical.
The neuromuscular junction (or synapse) involves with of the following two cell
types? - aNSwER-neuron:skeletal muscle
Which of the following neurotransmitters are released at the neuromuscular
junction? - aNSwER-acetylcholine
What type of channels bind to acetylcholine in the post-synaptic (muscle cell)
membrane? - aNSwER-chemical (ligand)-gated, (Acetylcholine is a chemical and it
provides the "key" to open channels in the muscle cell membrane.)
Receptors for acetylcholine are located in the motor end plate of the muscle cell.
T or F? - aNSwER-True, By definition, the motor end plate is the part of the muscle
cell membrane that forms a synapse with the somatic motor neuron.
What is the major role of acetylcholine esterase? - aNSwER-To break down
acetylcholine in the synaptic cleft. (Acetylcholine esterase enzymatically breaks
down acetylcholine from the cleft to STOP the signal from the motor neuron. This
is an important step that leads to muscle relaxation.)
Transverse tubules are extensions of which of the following organelles? -
aNSwER-sarcolemma
QUESTioNS aND CoRRECTLY wELL DEFiNED aNSwERS LaTEST
aLREaDY GRaDED a+
muscle fiber - aNSwER-an individual muscle cell
fasicle - aNSwER-a group of muscle cells within the belly of a muscle
sarcolemma - aNSwER-plasma membrane of skeletal muscle cells
sarcoplasm - aNSwER-the cytoplasm of a skeletal muscle cell
sarcomere - aNSwER-Contractile unit of a muscle cell that make a myofibirl
sarcoplasmic reticulum - aNSwER-Modified endoplasmic reticulum that regulates
calcium in the cell
T (transverse) tubules - aNSwER-Tubes continuous with the sarcolemma to
increase surface area
myofibril - aNSwER-The major component of a muscle cell (takes up the most
intracellular volume)
myoglobin - aNSwER-Oxygen-binding protein in a muscle cell
multi nucleate - aNSwER-Containing many nuclei
, epimysium - aNSwER-Fibrous connective tissue that is continuous with the
tendon
Which type of muscle cell(s) is (are) striated? Choose all that apply. - aNSwER-
skeletal, cardiac
Skeletal muscle tends to contain short, branched cells. T or F? - aNSwER-False,
Skeletal muscle cells tend to be very long and cylindrical.
The neuromuscular junction (or synapse) involves with of the following two cell
types? - aNSwER-neuron:skeletal muscle
Which of the following neurotransmitters are released at the neuromuscular
junction? - aNSwER-acetylcholine
What type of channels bind to acetylcholine in the post-synaptic (muscle cell)
membrane? - aNSwER-chemical (ligand)-gated, (Acetylcholine is a chemical and it
provides the "key" to open channels in the muscle cell membrane.)
Receptors for acetylcholine are located in the motor end plate of the muscle cell.
T or F? - aNSwER-True, By definition, the motor end plate is the part of the muscle
cell membrane that forms a synapse with the somatic motor neuron.
What is the major role of acetylcholine esterase? - aNSwER-To break down
acetylcholine in the synaptic cleft. (Acetylcholine esterase enzymatically breaks
down acetylcholine from the cleft to STOP the signal from the motor neuron. This
is an important step that leads to muscle relaxation.)
Transverse tubules are extensions of which of the following organelles? -
aNSwER-sarcolemma
