BIOD 151 Module 6: Exam Portage Learning Questions and Answers
2026 Practice Set
Module 6: The Nervous System Practice Set
1. The "Control Center" of the neuron that contains the nucleus is the:
• A. Axon
• B. Dendrite
• C. Cell Body (Soma) ✅
• D. Myelin Sheath
Rationale: The cell body (soma) integrates incoming signals and maintains the cell's
metabolic functions.
2. Which part of the neuron is responsible for receiving signals from other
neurons?
• A. Axon
• B. Dendrites ✅
• C. Synaptic terminal
• D. Node of Ranvier
Rationale: Dendrites act as the "input" region, branching out to catch chemical
messages.
3. The gaps between the Myelin Sheaths where action potentials "jump" are
called:
• A. Synaptic clefts
• B. Nodes of Ranvier ✅
• C. Axon hillocks
• D. Interneurons
,Rationale: Saltatory conduction occurs as the signal skips from one node to the next,
increasing speed.
4. Which neuroglial cell is responsible for forming the Myelin Sheath in the
Central Nervous System (CNS)?
• A. Schwann cells
• B. Astrocytes
• C. Oligodendrocytes ✅
• D. Microglia
Rationale: Oligodendrocytes myelinate multiple axons in the CNS; Schwann cells do so
in the PNS.
5. "Resting Membrane Potential" is typically measured at:
• A. +30 mV
• B. 0 mV
• C. -70 mV ✅
• D. -55 mV
Rationale: The inside of the neuron is more negative than the outside at rest.
6. During "Depolarization," which ion rushes into the cell?
• A. Potassium (K+)
• B. Sodium (Na+) ✅
• C. Calcium (Ca2+)
• D. Chloride (Cl-)
Rationale: Voltage-gated sodium channels open, making the inside of the cell more
positive.
7. The "Threshold" potential required to trigger an action potential is usually:
• A. -70 mV
• B. -55 mV ✅
• C. +30 mV
, • D. -90 mV
Rationale: This is the "point of no return" for the all-or-none response.
8. Which lobe of the brain is responsible for visual processing?
• A. Frontal
• B. Parietal
• C. Occipital ✅
• D. Temporal
Rationale: The primary visual cortex is located at the very back of the brain.
9. The "Fight or Flight" response is controlled by the:
• A. Parasympathetic Nervous System
• B. Sympathetic Nervous System ✅
• C. Somatic Nervous System
• D. Central Nervous System
Rationale: This system increases heart rate and dilates pupils during stress.
10. The thick, outermost layer of the meninges is the:
• A. Pia mater
• B. Arachnoid mater
• C. Dura mater ✅
• D. Subarachnoid space
Rationale: Dura mater means "tough mother" in Latin.
11. Which structure connects the left and right hemispheres of the brain?
• A. Thalamus
• B. Corpus Callosum ✅
• C. Pons
• D. Cerebellum
2026 Practice Set
Module 6: The Nervous System Practice Set
1. The "Control Center" of the neuron that contains the nucleus is the:
• A. Axon
• B. Dendrite
• C. Cell Body (Soma) ✅
• D. Myelin Sheath
Rationale: The cell body (soma) integrates incoming signals and maintains the cell's
metabolic functions.
2. Which part of the neuron is responsible for receiving signals from other
neurons?
• A. Axon
• B. Dendrites ✅
• C. Synaptic terminal
• D. Node of Ranvier
Rationale: Dendrites act as the "input" region, branching out to catch chemical
messages.
3. The gaps between the Myelin Sheaths where action potentials "jump" are
called:
• A. Synaptic clefts
• B. Nodes of Ranvier ✅
• C. Axon hillocks
• D. Interneurons
,Rationale: Saltatory conduction occurs as the signal skips from one node to the next,
increasing speed.
4. Which neuroglial cell is responsible for forming the Myelin Sheath in the
Central Nervous System (CNS)?
• A. Schwann cells
• B. Astrocytes
• C. Oligodendrocytes ✅
• D. Microglia
Rationale: Oligodendrocytes myelinate multiple axons in the CNS; Schwann cells do so
in the PNS.
5. "Resting Membrane Potential" is typically measured at:
• A. +30 mV
• B. 0 mV
• C. -70 mV ✅
• D. -55 mV
Rationale: The inside of the neuron is more negative than the outside at rest.
6. During "Depolarization," which ion rushes into the cell?
• A. Potassium (K+)
• B. Sodium (Na+) ✅
• C. Calcium (Ca2+)
• D. Chloride (Cl-)
Rationale: Voltage-gated sodium channels open, making the inside of the cell more
positive.
7. The "Threshold" potential required to trigger an action potential is usually:
• A. -70 mV
• B. -55 mV ✅
• C. +30 mV
, • D. -90 mV
Rationale: This is the "point of no return" for the all-or-none response.
8. Which lobe of the brain is responsible for visual processing?
• A. Frontal
• B. Parietal
• C. Occipital ✅
• D. Temporal
Rationale: The primary visual cortex is located at the very back of the brain.
9. The "Fight or Flight" response is controlled by the:
• A. Parasympathetic Nervous System
• B. Sympathetic Nervous System ✅
• C. Somatic Nervous System
• D. Central Nervous System
Rationale: This system increases heart rate and dilates pupils during stress.
10. The thick, outermost layer of the meninges is the:
• A. Pia mater
• B. Arachnoid mater
• C. Dura mater ✅
• D. Subarachnoid space
Rationale: Dura mater means "tough mother" in Latin.
11. Which structure connects the left and right hemispheres of the brain?
• A. Thalamus
• B. Corpus Callosum ✅
• C. Pons
• D. Cerebellum
