Q: Which equation best represents the Nernst equation for calculating the equilibrium potential of an ion across a membrane?

$$E = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{outside}}}{[\text{ion}]_{\text{inside}}} \right)$$

Question 1

Which of the following best describes the process of depolarization in a neuron during the conduction of a nerve impulse?

Accepted Answer

Sodium ions rapidly enter the neuron, making the inside more positive.

Question 2

Which part of the brain is primarily responsible for regulating basic life functions such as breathing and heart rate?

Accepted Answer

Medulla oblongata

Question 3

A patient is unable to form new memories after a head injury. Which brain structure is most likely damaged?

Accepted Answer

Hippocampus

Question 4

Which of the following is a correct sequence of events during the conduction of an action potential along an axon?

Accepted Answer

Depolarization → Repolarization → Resting potential

Question 5

Which neurotransmitter is most commonly associated with the transmission of signals at neuromuscular junctions?

Accepted Answer

Acetylcholine

Question 6

What is the main difference between the sympathetic and parasympathetic divisions of the autonomic nervous system?

Accepted Answer

Sympathetic prepares the body for 'fight or flight', parasympathetic promotes 'rest and digest'.

Question 7

Which of the following best explains why myelinated axons conduct nerve impulses faster than unmyelinated axons?

Accepted Answer

Myelin allows action potentials to jump between nodes of Ranvier, a process called saltatory conduction.

Question 8

A person with damage to the occipital lobe would most likely experience problems with which function?

Accepted Answer

Vision

Question 9

Which equation best represents the Nernst equation for calculating the equilibrium potential of an ion across a membrane?

Accepted Answer

$$E = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight)$$

Question 10

Which of the following is NOT a function of the hypothalamus?

Accepted Answer

Coordination of voluntary muscle movement

Question 11

A person is experiencing rapid heartbeat, dilated pupils, and increased sweating after a car accident. Which division of the nervous system is most active?

Accepted Answer

Sympathetic nervous system

Question 12

Which structure in the neuron is responsible for receiving signals from other neurons?

Accepted Answer

Dendrite

Question 13

Which of the following best describes the role of enzymes in neurotransmitter function at the synapse?

Accepted Answer

Enzymes break down neurotransmitters to terminate the signal.

Question 14

Which part of the ear is responsible for converting sound waves into electrical signals for the brain?

Accepted Answer

Cochlea

Question 15

A patient is diagnosed with myopia. Which of the following best describes their vision defect?

Accepted Answer

They have difficulty seeing objects that are far away.

Question 16

Which of the following is a correct pathway for a somatic reflex arc?

Accepted Answer

Receptor → Sensory neuron → Interneuron → Motor neuron → Effector

Question 17

Which lobe of the brain is primarily responsible for processing auditory information?

Accepted Answer

Temporal lobe

Question 18

Which of the following best explains the difference between gray matter and white matter in the nervous system?

Accepted Answer

Gray matter contains cell bodies and dendrites, white matter contains myelinated axons.

Question 19

A person is unable to move their right arm after a stroke. Which part of the brain is most likely affected?

Accepted Answer

Left motor cortex

Question 20

Which of the following best describes the function of the thalamus?

Accepted Answer

Relays sensory information to the appropriate areas of the brain.

Unit 1: The Nervous System – Structure, Function, and Organization

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