, BIOS 252 Anatomy and Physiology II Exam 3 –Actual
Questions with Revised Answers, 100% Verified -
Chamberlain University
Question 1
A _________ with a _________ diameter carries electrical impulses the fastest.
A) Myelinated, Large
B) Unmyelinated, Large
C) Myelinated, Small
D) Unmyelinated, Small
Answer: A) Myelinated, Large
Rationale: Myelinated axons with large diameters conduct action potentials the fastest
due to saltatory conduction and reduced resistance . Myelination increases speed by
allowing impulses to "jump" between nodes of Ranvier.
Question 2
The finger-like projections extending from the neuron's cell body that are most
frequently the site of stimulation and formation of graded potentials are called:
A) Axons
B) Dendrites
C) Synaptic boutons
D) Axon hillocks
Answer: B) Dendrites
Rationale: Dendrites are the branched extensions of a neuron that receive signals from
other neurons and are the primary site of stimulation and graded potential formation.
Question 3
,Which type of receptor detects mechanical changes such as touch, pressure, vibration,
and stretch?
A) Chemoreceptors
B) Nociceptors
C) Mechanoreceptors
D) Photoreceptors
Answer: C) Mechanoreceptors
Rationale: Mechanoreceptors sense mechanical changes including touch, pressure,
vibration, stretch, and itch. Tactile sensations have many sensory modalities including
touch, pressure, itch, tickle, vibrations, stretching, and proprioception .
Question 4
Which receptor type is responsible for detecting painful stimuli?
A) Mechanoreceptors
B) Proprioceptors
C) Nociceptors
D) Photoreceptors
Answer: C) Nociceptors
Rationale: Nociceptors are specialized nerve endings that detect potentially harmful
stimuli leading to the sensation of pain . Fast pain is sharp and stabbing, while slow pain
is dull and aching.
Question 5
Which receptor type detects changes in temperature?
A) Mechanoreceptors
B) Osmoreceptors
C) Thermoreceptors
D) Chemoreceptors
Answer: C) Thermoreceptors
, Rationale: Thermoreceptors sense changes in temperature. They are classified into
receptors for heat and receptors for cold.
Question 6
Chemoreceptors are chemical sensors that detect:
A) Light
B) Pain
C) Chemical changes in the body
D) Mechanical pressure
Answer: C) Chemical changes in the body
Rationale: Chemoreceptors sense chemicals. They are found in the brain and blood
vessels and identify changing levels of oxygen and carbon dioxide .
Question 7
Photoreceptors are responsible for:
A) Detecting sound
B) Sensing temperature
C) Converting light into electrical signals
D) Monitoring blood glucose levels
Answer: C) Converting light into electrical signals
Rationale: Photoreceptors, including rods and cones in the retina, convert light into
electrical impulses that the brain interprets as visual images.
Question 8
The prefix "Proprio" means "self" or "one's own." Proprioceptors communicate to your
brain:
A) How hot or cold you are
B) How the body is positioned
Questions with Revised Answers, 100% Verified -
Chamberlain University
Question 1
A _________ with a _________ diameter carries electrical impulses the fastest.
A) Myelinated, Large
B) Unmyelinated, Large
C) Myelinated, Small
D) Unmyelinated, Small
Answer: A) Myelinated, Large
Rationale: Myelinated axons with large diameters conduct action potentials the fastest
due to saltatory conduction and reduced resistance . Myelination increases speed by
allowing impulses to "jump" between nodes of Ranvier.
Question 2
The finger-like projections extending from the neuron's cell body that are most
frequently the site of stimulation and formation of graded potentials are called:
A) Axons
B) Dendrites
C) Synaptic boutons
D) Axon hillocks
Answer: B) Dendrites
Rationale: Dendrites are the branched extensions of a neuron that receive signals from
other neurons and are the primary site of stimulation and graded potential formation.
Question 3
,Which type of receptor detects mechanical changes such as touch, pressure, vibration,
and stretch?
A) Chemoreceptors
B) Nociceptors
C) Mechanoreceptors
D) Photoreceptors
Answer: C) Mechanoreceptors
Rationale: Mechanoreceptors sense mechanical changes including touch, pressure,
vibration, stretch, and itch. Tactile sensations have many sensory modalities including
touch, pressure, itch, tickle, vibrations, stretching, and proprioception .
Question 4
Which receptor type is responsible for detecting painful stimuli?
A) Mechanoreceptors
B) Proprioceptors
C) Nociceptors
D) Photoreceptors
Answer: C) Nociceptors
Rationale: Nociceptors are specialized nerve endings that detect potentially harmful
stimuli leading to the sensation of pain . Fast pain is sharp and stabbing, while slow pain
is dull and aching.
Question 5
Which receptor type detects changes in temperature?
A) Mechanoreceptors
B) Osmoreceptors
C) Thermoreceptors
D) Chemoreceptors
Answer: C) Thermoreceptors
, Rationale: Thermoreceptors sense changes in temperature. They are classified into
receptors for heat and receptors for cold.
Question 6
Chemoreceptors are chemical sensors that detect:
A) Light
B) Pain
C) Chemical changes in the body
D) Mechanical pressure
Answer: C) Chemical changes in the body
Rationale: Chemoreceptors sense chemicals. They are found in the brain and blood
vessels and identify changing levels of oxygen and carbon dioxide .
Question 7
Photoreceptors are responsible for:
A) Detecting sound
B) Sensing temperature
C) Converting light into electrical signals
D) Monitoring blood glucose levels
Answer: C) Converting light into electrical signals
Rationale: Photoreceptors, including rods and cones in the retina, convert light into
electrical impulses that the brain interprets as visual images.
Question 8
The prefix "Proprio" means "self" or "one's own." Proprioceptors communicate to your
brain:
A) How hot or cold you are
B) How the body is positioned
