EXAM 2: BIOS 252 / BIOS252 – ANATOMY AND PHYSIOLOGY II (2027)
| CHAMBERLAIN UNIVERSITY
BIOS 252 / BIOS252 Anatomy and Physiology II Exam 2 preparation
Questions 1–250
Section 1: Reflex Arcs & Polysynaptic Reflexes (Questions 1–30)
1. What characterizes a polysynaptic reflex?
A) It lacks sensory neurons.
B) It involves an interneuron within the spinal cord.
C) It does not involve motor neurons.
D) It requires the participation of the brain.
Answer B: It involves an interneuron within the spinal cord.
,Rationale: A polysynaptic reflex arc incorporates at least one
interneuron within the spinal cord, creating a pathway with multiple
synapses between sensory and motor neurons.
2. Polysynaptic reflexes involve which type of neuron?
A) Astrocyte
B) Schwann cell
C) Interneuron
D) Motor neuron
Answer C: Interneuron
Rationale: Polysynaptic reflexes include interneurons, which serve as
relay points within the spinal cord connecting sensory to motor
neurons.
3. What are the primary functions of the spinal cord?
A) Conduction, neural integration, locomotion, reflexes
B) Respiration, digestion, locomotion, defecation
C) Speech, vision, hearing, conduction
D) Smell, taste, balance, conduction
,Answer A: Conduction, neural integration, locomotion, reflexes
Rationale: The spinal cord conducts nerve signals, integrates neural
information, facilitates movement patterns, and manages reflex
actions.
4. Which of the following components are part of the reflex arc?
(Select all that apply) E) Muscle effector
A) Receptor
B) Sensory neuron
C) Spinal cord
D) Motor neuron
Answer A: , B, C, D, E
Rationale: The reflex arc includes all five components: receptor,
sensory neuron, spinal cord (integration center), motor neuron, and
effector.
5. A polysynaptic reflex differs from a monosynaptic reflex because
it:
A) Lacks sensory neurons
, B) Involves at least one interneuron
C) Does not involve motor neurons
D) Requires brain participation
Answer B: Involves at least one interneuron
Rationale: Monosynaptic reflexes have a direct synapse between
sensory and motor neurons; polysynaptic reflexes include
interneurons for more complex processing.
6. Which of the following is an example of a monosynaptic reflex?
A) Withdrawal reflex
B) Stretch reflex (patellar tendon reflex)
C) Crossed extensor reflex
D) Flexor reflex
Answer B: Stretch reflex (patellar tendon reflex)
Rationale: The stretch reflex involves a direct synapse between
sensory and motor neurons without interneurons.
7. The integration center of a reflex arc is typically located in the:
A) Peripheral nerve
| CHAMBERLAIN UNIVERSITY
BIOS 252 / BIOS252 Anatomy and Physiology II Exam 2 preparation
Questions 1–250
Section 1: Reflex Arcs & Polysynaptic Reflexes (Questions 1–30)
1. What characterizes a polysynaptic reflex?
A) It lacks sensory neurons.
B) It involves an interneuron within the spinal cord.
C) It does not involve motor neurons.
D) It requires the participation of the brain.
Answer B: It involves an interneuron within the spinal cord.
,Rationale: A polysynaptic reflex arc incorporates at least one
interneuron within the spinal cord, creating a pathway with multiple
synapses between sensory and motor neurons.
2. Polysynaptic reflexes involve which type of neuron?
A) Astrocyte
B) Schwann cell
C) Interneuron
D) Motor neuron
Answer C: Interneuron
Rationale: Polysynaptic reflexes include interneurons, which serve as
relay points within the spinal cord connecting sensory to motor
neurons.
3. What are the primary functions of the spinal cord?
A) Conduction, neural integration, locomotion, reflexes
B) Respiration, digestion, locomotion, defecation
C) Speech, vision, hearing, conduction
D) Smell, taste, balance, conduction
,Answer A: Conduction, neural integration, locomotion, reflexes
Rationale: The spinal cord conducts nerve signals, integrates neural
information, facilitates movement patterns, and manages reflex
actions.
4. Which of the following components are part of the reflex arc?
(Select all that apply) E) Muscle effector
A) Receptor
B) Sensory neuron
C) Spinal cord
D) Motor neuron
Answer A: , B, C, D, E
Rationale: The reflex arc includes all five components: receptor,
sensory neuron, spinal cord (integration center), motor neuron, and
effector.
5. A polysynaptic reflex differs from a monosynaptic reflex because
it:
A) Lacks sensory neurons
, B) Involves at least one interneuron
C) Does not involve motor neurons
D) Requires brain participation
Answer B: Involves at least one interneuron
Rationale: Monosynaptic reflexes have a direct synapse between
sensory and motor neurons; polysynaptic reflexes include
interneurons for more complex processing.
6. Which of the following is an example of a monosynaptic reflex?
A) Withdrawal reflex
B) Stretch reflex (patellar tendon reflex)
C) Crossed extensor reflex
D) Flexor reflex
Answer B: Stretch reflex (patellar tendon reflex)
Rationale: The stretch reflex involves a direct synapse between
sensory and motor neurons without interneurons.
7. The integration center of a reflex arc is typically located in the:
A) Peripheral nerve
