BIOS 252 EXAM ACTUAL EXAM
COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS 2026/2027 (GRADED
A+) DETAILED ANSWERS
An inhibitory neurotransmitter ________ the postsynaptic
membrane
A. Depolarizers
B. Repolarizes
C. Hyperpolarizes
D. Reverses the polarity of the
E. Moves channels to the internal axonal membrane
Correct Answer C. hyperpolarizes
_______ cells function as immune/phagocytic cells within
the central nervous system
A. Ependymal
B. Astrocytes
C. Microglial
D. Schwann
E. Oligodendrogital Correct Answer C. Microglial
The myelin sheaths that surround the axons of some of
the neurons in the centra nervous system are formed by
A. Astrocytes
B. Oligodendrocytes
,C. Microglia
D. Ependymal cells
E. Schwann cells Correct Answer B. Oligodendrocytes
A muscle that provides the major force of producing a
specific movement is called
A. An antagonist
B. An agonist
C. A synergist
D. A fixation
E. A sidekick Correct Answer B. An agonist
During inhalation, ________ muscles contract to elevate
the ribs. During forced exhalation, _______ muscles
contract to depress the ribs
A. External intercostals ; internal intercostals
B. Transverse abdominis ; diaphragm
C. Diaphragm ; transverse abdominis
D. Internal intercostals ; external intercostals
E. Rectus abdominis ; external obliques Correct Answer
A. External intercostals ; internal intercostals
Which of the following are functions of various neuroglial
cells
A. Forming myelin sheaths on axons
B. Secreting cerebrospinal fluid
C. Transmitting electrical impulses to the spinal cord
D. Storing episodic memories
, E. Acting as phagocytes Correct Answer A. Forming
myelin sheaths on axons, B. Secreting cerebrospinal fluid,
E. Acting as phagocytes
During active muscle contraction, the myosin heads will
bind to which protein?
A. Dystrophin
B. Actin
C. Titan
D. Troponin
E. Tropomyosin Correct Answer B. Actin
Which of the following glial cells are NOT found in the
Central Nervous System?
A. Astrocytes
B. Schwann cells
C. Oligodendrocytes
D. Ependymal cells
E. Microglial cells Correct Answer B. Schwann cells
Which of the following would increase the conduction
velocity of an action potential?
A. Myelin sheath covering the axon
B. Colder temperatures
C. Longer axon length
D. Increased intensity of the action potential
E. Higher (less negative) resting membrane potential
Correct Answer A. Myelin sheath covering the axon
COMPREHENSIVE QUESTIONS AND
VERIFIED ANSWERS 2026/2027 (GRADED
A+) DETAILED ANSWERS
An inhibitory neurotransmitter ________ the postsynaptic
membrane
A. Depolarizers
B. Repolarizes
C. Hyperpolarizes
D. Reverses the polarity of the
E. Moves channels to the internal axonal membrane
Correct Answer C. hyperpolarizes
_______ cells function as immune/phagocytic cells within
the central nervous system
A. Ependymal
B. Astrocytes
C. Microglial
D. Schwann
E. Oligodendrogital Correct Answer C. Microglial
The myelin sheaths that surround the axons of some of
the neurons in the centra nervous system are formed by
A. Astrocytes
B. Oligodendrocytes
,C. Microglia
D. Ependymal cells
E. Schwann cells Correct Answer B. Oligodendrocytes
A muscle that provides the major force of producing a
specific movement is called
A. An antagonist
B. An agonist
C. A synergist
D. A fixation
E. A sidekick Correct Answer B. An agonist
During inhalation, ________ muscles contract to elevate
the ribs. During forced exhalation, _______ muscles
contract to depress the ribs
A. External intercostals ; internal intercostals
B. Transverse abdominis ; diaphragm
C. Diaphragm ; transverse abdominis
D. Internal intercostals ; external intercostals
E. Rectus abdominis ; external obliques Correct Answer
A. External intercostals ; internal intercostals
Which of the following are functions of various neuroglial
cells
A. Forming myelin sheaths on axons
B. Secreting cerebrospinal fluid
C. Transmitting electrical impulses to the spinal cord
D. Storing episodic memories
, E. Acting as phagocytes Correct Answer A. Forming
myelin sheaths on axons, B. Secreting cerebrospinal fluid,
E. Acting as phagocytes
During active muscle contraction, the myosin heads will
bind to which protein?
A. Dystrophin
B. Actin
C. Titan
D. Troponin
E. Tropomyosin Correct Answer B. Actin
Which of the following glial cells are NOT found in the
Central Nervous System?
A. Astrocytes
B. Schwann cells
C. Oligodendrocytes
D. Ependymal cells
E. Microglial cells Correct Answer B. Schwann cells
Which of the following would increase the conduction
velocity of an action potential?
A. Myelin sheath covering the axon
B. Colder temperatures
C. Longer axon length
D. Increased intensity of the action potential
E. Higher (less negative) resting membrane potential
Correct Answer A. Myelin sheath covering the axon
