ANP1105- Midterm 1 Test Questions
and Answers.
Potassium - Answer 1. Immediately after an action potential has peaked, which cellular gates
open?
Store calcium ions - Answer The major function of the sarcoplasmic reticulum in muscle cells is
to
Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin
molecules - Answer What is the role of tropomyosin in skeletal muscles?
A. Tropomyosin is the name of a contracting unit
B. Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the
actin molecules
C. Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the
myosin molecules
D. Tropomyosin is the receptor for the motor neuron neurotransmitter
Acetylcholine - Answer The neurotransmitter released at neuromuscular junctions between
motor axons and skeletal muscle is:
ground substance, fibers, and cells - Answer The 3 Main components of connective tissue are
Axon hillock (initial segment) - Answer The region of the neuron where the action potential is
first generated is called the
hypertonic solution - Answer Crenation (cell shrinking) occurs when red blood cells are placed
in a(n):
actin - Answer In the sliding filament model of muscle contraction, the ____ myofilaments
move toward each other
Produce only graded potentials - Answer Dendrites
, The hyperpolarization undershoot occurs because K ion gates are slow to close - Answer
Which of the following statements about an action potential is true?
A. Threshold is usually 0mV
B. The hyperpolarization undershoot occurs because K ion gates are slow to close
C. Inactivation Na ion gates respond more rapidly than activation Na gates
D. Action potentials decrease in amplitude with distance traveled
E. A second depolarization can occur during the absolute refractory period if the stimulus is
greater than threshold
cardiac muscle tissue - Answer The type of muscle tissue that is both striated and involuntary
is:
endomysium - Answer The thin connective tissue investing each muscle cell is called:
Na ions would move into the cell - Answer What would happen if a resting neuron suddenly
became very permeable to Na ions?
glucose - Answer Which of the following does not cross the plasma membrane by simple
diffusion?
A. Oxygen
B. Urea
C. Alcohol
D. Glucose
E. Carbon dioxide
A myelinated fiber conducts impulses faster than an unmyelinated fiber (axon) - Answer
Which of the following statements is true?
A. a myelin sheath increases conduction velocity because it contains many ion channels
B. conduction velocity of an axon decreases with increasing axon diameter
C. neurons are the only polarized cells in the body
D. a myelinated fiber conducts impulses faster than an unmyelinated fiber (axon)
E. conduction velocity of axon is always the same
and Answers.
Potassium - Answer 1. Immediately after an action potential has peaked, which cellular gates
open?
Store calcium ions - Answer The major function of the sarcoplasmic reticulum in muscle cells is
to
Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin
molecules - Answer What is the role of tropomyosin in skeletal muscles?
A. Tropomyosin is the name of a contracting unit
B. Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the
actin molecules
C. Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on the
myosin molecules
D. Tropomyosin is the receptor for the motor neuron neurotransmitter
Acetylcholine - Answer The neurotransmitter released at neuromuscular junctions between
motor axons and skeletal muscle is:
ground substance, fibers, and cells - Answer The 3 Main components of connective tissue are
Axon hillock (initial segment) - Answer The region of the neuron where the action potential is
first generated is called the
hypertonic solution - Answer Crenation (cell shrinking) occurs when red blood cells are placed
in a(n):
actin - Answer In the sliding filament model of muscle contraction, the ____ myofilaments
move toward each other
Produce only graded potentials - Answer Dendrites
, The hyperpolarization undershoot occurs because K ion gates are slow to close - Answer
Which of the following statements about an action potential is true?
A. Threshold is usually 0mV
B. The hyperpolarization undershoot occurs because K ion gates are slow to close
C. Inactivation Na ion gates respond more rapidly than activation Na gates
D. Action potentials decrease in amplitude with distance traveled
E. A second depolarization can occur during the absolute refractory period if the stimulus is
greater than threshold
cardiac muscle tissue - Answer The type of muscle tissue that is both striated and involuntary
is:
endomysium - Answer The thin connective tissue investing each muscle cell is called:
Na ions would move into the cell - Answer What would happen if a resting neuron suddenly
became very permeable to Na ions?
glucose - Answer Which of the following does not cross the plasma membrane by simple
diffusion?
A. Oxygen
B. Urea
C. Alcohol
D. Glucose
E. Carbon dioxide
A myelinated fiber conducts impulses faster than an unmyelinated fiber (axon) - Answer
Which of the following statements is true?
A. a myelin sheath increases conduction velocity because it contains many ion channels
B. conduction velocity of an axon decreases with increasing axon diameter
C. neurons are the only polarized cells in the body
D. a myelinated fiber conducts impulses faster than an unmyelinated fiber (axon)
E. conduction velocity of axon is always the same
