BIOD 152 Anatomy and Physiology 2 MODULE 1
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,### 1. Name and describe what is occurring in the neuron cell
membrane in section 2 of the diagram. Include the charge of the
membrane during this phase.
Answer:
- Depolarization: Sodium gates open allowing sodium ions (Na⁺) to rush
into the neuron
,- The membrane potential rapidly rises from the resting state (-70mV) up
past zero to approximately +40mV
- This phase initiates the action potential as the inside of the membrane
becomes positively charged compared to the outside
Rationale: Depolarization is key to the generation of an action potential;
sodium influx reverses the polarization of the membrane.
### 2. The dorsal root of a nerve contains what type of neurons?
a) Motor / Efferent
b) Sensory / Afferent
c) Interneurons
d) Both motor and sensory neurons
Correct Answer: b) Sensory / Afferent
Rationale: The dorsal root contains sensory (afferent) neurons that bring
information from the periphery into the spinal cord, whereas the ventral root
contains motor (efferent) neurons that send signals from the spinal cord to
muscles.
---
### 3. This part of the autonomic system accelerates the heartbeat
and increases breathing rate.
a) Parasympathetic nervous system
b) Sympathetic nervous system
, c) Somatic nervous system
d) Enteric nervous system
Correct Answer: b) Sympathetic nervous system
Rationale: The sympathetic nervous system is responsible for the "fight or
flight" response, which includes increased heart rate and respiratory rate.
The parasympathetic system slows these functions.
### 4. This part of a neuron conducts nerve impulses towards the cell
body.
a) Axon
b) Dendrites
c) Synaptic terminals
d) Myelin sheath
Correct Answer: b) Dendrites
Rationale: Dendrites receive electrical signals from other neurons and
conduct these impulses toward the neuron’s cell body.
### 5. A neuron going to the bicep of the forearm is part of the:
a) Central nervous system only
b) Peripheral nervous system only
c) Central nervous system and autonomic nervous system
EXAM questions and verified Answers Portage
Learning latest updated 100% accurate
,### 1. Name and describe what is occurring in the neuron cell
membrane in section 2 of the diagram. Include the charge of the
membrane during this phase.
Answer:
- Depolarization: Sodium gates open allowing sodium ions (Na⁺) to rush
into the neuron
,- The membrane potential rapidly rises from the resting state (-70mV) up
past zero to approximately +40mV
- This phase initiates the action potential as the inside of the membrane
becomes positively charged compared to the outside
Rationale: Depolarization is key to the generation of an action potential;
sodium influx reverses the polarization of the membrane.
### 2. The dorsal root of a nerve contains what type of neurons?
a) Motor / Efferent
b) Sensory / Afferent
c) Interneurons
d) Both motor and sensory neurons
Correct Answer: b) Sensory / Afferent
Rationale: The dorsal root contains sensory (afferent) neurons that bring
information from the periphery into the spinal cord, whereas the ventral root
contains motor (efferent) neurons that send signals from the spinal cord to
muscles.
---
### 3. This part of the autonomic system accelerates the heartbeat
and increases breathing rate.
a) Parasympathetic nervous system
b) Sympathetic nervous system
, c) Somatic nervous system
d) Enteric nervous system
Correct Answer: b) Sympathetic nervous system
Rationale: The sympathetic nervous system is responsible for the "fight or
flight" response, which includes increased heart rate and respiratory rate.
The parasympathetic system slows these functions.
### 4. This part of a neuron conducts nerve impulses towards the cell
body.
a) Axon
b) Dendrites
c) Synaptic terminals
d) Myelin sheath
Correct Answer: b) Dendrites
Rationale: Dendrites receive electrical signals from other neurons and
conduct these impulses toward the neuron’s cell body.
### 5. A neuron going to the bicep of the forearm is part of the:
a) Central nervous system only
b) Peripheral nervous system only
c) Central nervous system and autonomic nervous system
