BIOS 150 Week 3 Quiz Exam 3 (Latest
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. The nervous system is divided into:
A. Central and peripheral nervous systems
B. Somatic only
C. Autonomic only
D. Sensory only
Correct Answer: A. Central and peripheral nervous systems
Rationale: CNS consists of brain and spinal cord; PNS connects
CNS to the body.
2. The basic functional unit of the nervous system is:
A. Muscle fiber
B. Neuron
C. Axon
D. Dendrite
Correct Answer: B. Neuron
,Rationale: Neurons transmit electrical impulses throughout the
body.
3. Dendrites function to:
A. Transmit impulses away from the cell body
B. Receive signals from other neurons
C. Store neurotransmitters
D. Produce myelin
Correct Answer: B. Receive signals from other neurons
Rationale: Dendrites increase surface area for signal reception.
4. Axons function to:
A. Receive impulses
B. Transmit impulses away from the cell body
C. Store calcium
D. Produce neurotransmitters only in soma
Correct Answer: B. Transmit impulses away from the cell body
Rationale: Axons conduct action potentials to other neurons or
effectors.
5. Myelin sheath:
A. Speeds up nerve conduction
B. Slows down nerve conduction
C. Stores neurotransmitters
D. Produces action potentials
,Correct Answer: A. Speeds up nerve conduction
Rationale: Insulates axons and allows saltatory conduction.
6. Nodes of Ranvier:
A. Areas of myelin
B. Gaps in myelin sheath
C. Dendrites
D. Neurotransmitters
Correct Answer: B. Gaps in myelin sheath
Rationale: Action potentials jump between nodes to speed
conduction.
7. Schwann cells:
A. Form myelin in CNS
B. Form myelin in PNS
C. Produce neurotransmitters
D. Store calcium
Correct Answer: B. Form myelin in PNS
Rationale: Schwann cells wrap around axons in the peripheral
nervous system.
8. Oligodendrocytes:
A. Form myelin in CNS
B. Form myelin in PNS
C. Support muscles
, D. Conduct action potentials
Correct Answer: A. Form myelin in CNS
Rationale: Oligodendrocytes myelinate multiple CNS axons.
9. The resting membrane potential of a neuron is approximately:
A. +70 mV
B. -70 mV
C. 0 mV
D. -90 mV
Correct Answer: B. -70 mV
Rationale: Inside of the neuron is negative relative to outside at rest.
10. The sodium-potassium pump:
A. Moves Na+ in and K+ out
B. Moves Na+ out and K+ in
C. Moves calcium only
D. Moves Cl- only
Correct Answer: B. Moves Na+ out and K+ in
Rationale: Maintains resting membrane potential and ion gradients.
11. During depolarization:
A. Na+ channels open, Na+ enters
B. K+ channels open, K+ leaves
C. Na+ leaves the neuron
D. Membrane becomes more negative
Update ) Anatomy and
Physiology IV with Lab | Questions &
Answers | 100% Correct | Grade A -
Chamberlain
1. The nervous system is divided into:
A. Central and peripheral nervous systems
B. Somatic only
C. Autonomic only
D. Sensory only
Correct Answer: A. Central and peripheral nervous systems
Rationale: CNS consists of brain and spinal cord; PNS connects
CNS to the body.
2. The basic functional unit of the nervous system is:
A. Muscle fiber
B. Neuron
C. Axon
D. Dendrite
Correct Answer: B. Neuron
,Rationale: Neurons transmit electrical impulses throughout the
body.
3. Dendrites function to:
A. Transmit impulses away from the cell body
B. Receive signals from other neurons
C. Store neurotransmitters
D. Produce myelin
Correct Answer: B. Receive signals from other neurons
Rationale: Dendrites increase surface area for signal reception.
4. Axons function to:
A. Receive impulses
B. Transmit impulses away from the cell body
C. Store calcium
D. Produce neurotransmitters only in soma
Correct Answer: B. Transmit impulses away from the cell body
Rationale: Axons conduct action potentials to other neurons or
effectors.
5. Myelin sheath:
A. Speeds up nerve conduction
B. Slows down nerve conduction
C. Stores neurotransmitters
D. Produces action potentials
,Correct Answer: A. Speeds up nerve conduction
Rationale: Insulates axons and allows saltatory conduction.
6. Nodes of Ranvier:
A. Areas of myelin
B. Gaps in myelin sheath
C. Dendrites
D. Neurotransmitters
Correct Answer: B. Gaps in myelin sheath
Rationale: Action potentials jump between nodes to speed
conduction.
7. Schwann cells:
A. Form myelin in CNS
B. Form myelin in PNS
C. Produce neurotransmitters
D. Store calcium
Correct Answer: B. Form myelin in PNS
Rationale: Schwann cells wrap around axons in the peripheral
nervous system.
8. Oligodendrocytes:
A. Form myelin in CNS
B. Form myelin in PNS
C. Support muscles
, D. Conduct action potentials
Correct Answer: A. Form myelin in CNS
Rationale: Oligodendrocytes myelinate multiple CNS axons.
9. The resting membrane potential of a neuron is approximately:
A. +70 mV
B. -70 mV
C. 0 mV
D. -90 mV
Correct Answer: B. -70 mV
Rationale: Inside of the neuron is negative relative to outside at rest.
10. The sodium-potassium pump:
A. Moves Na+ in and K+ out
B. Moves Na+ out and K+ in
C. Moves calcium only
D. Moves Cl- only
Correct Answer: B. Moves Na+ out and K+ in
Rationale: Maintains resting membrane potential and ion gradients.
11. During depolarization:
A. Na+ channels open, Na+ enters
B. K+ channels open, K+ leaves
C. Na+ leaves the neuron
D. Membrane becomes more negative
