Q: Which of the following equations best represents the concept of the 'encephalization quotient' (EQ) as it relates to brain size and body size?

$$ EQ = \frac{\text{Actual brain mass}}{\text{Expected brain mass for body size}} $$

Question 1

Which of the following best describes the main function of the Central Nervous System (CNS)?

Accepted Answer

It processes information and coordinates the activity of all parts of the body.

Question 2

Which of the following is NOT a division of the Peripheral Nervous System (PNS)?

Accepted Answer

Central Nervous System

Question 3

A person quickly pulls their hand away after touching a hot stove. Which pathway is primarily responsible for this reflex action?

Accepted Answer

The sensory neuron sends a signal to the spinal cord, which immediately sends a response via a motor neuron.

Question 4

Which of the following statements about the autonomic nervous system is TRUE?

Accepted Answer

It is divided into sympathetic, parasympathetic, and enteric divisions.

Question 5

During a stressful situation, which division of the autonomic nervous system is primarily activated, and what is a typical physiological response?

Accepted Answer

Sympathetic; increased heart rate

Question 6

Which nerve is most directly involved in the communication between the brain and the heart, and is also a major component of the parasympathetic nervous system?

Accepted Answer

Vagus nerve

Question 7

The enteric nervous system is sometimes called the 'second brain.' Which of the following best explains why?

Accepted Answer

It contains a vast network of neurons that independently regulate gastrointestinal function.

Question 8

Which of the following best describes the difference between the somatic and autonomic nervous systems?

Accepted Answer

The somatic nervous system controls voluntary actions, while the autonomic nervous system controls involuntary actions.

Question 9

Which neurotransmitter is primarily released by postganglionic neurons of the sympathetic nervous system?

Accepted Answer

Norepinephrine

Question 10

A patient is experiencing increased heart rate, dilated pupils, and decreased digestive activity. Which branch of the nervous system is most likely responsible for these symptoms?

Accepted Answer

Sympathetic nervous system

Question 11

Which of the following equations best represents the concept of the 'encephalization quotient' (EQ) as it relates to brain size and body size?

Accepted Answer

$$ EQ = \frac{	ext{Actual brain mass}}{	ext{Expected brain mass for body size}} $$

Question 12

Which of the following is a function of the parasympathetic nervous system?

Accepted Answer

Promoting digestion and energy storage

Question 13

Which of the following best describes the role of the spinal cord in the nervous system?

Accepted Answer

It acts as a two-way communication pathway between the brain and the peripheral nervous system.

Question 14

Which of the following scenarios best illustrates the function of the somatic nervous system?

Accepted Answer

You voluntarily raise your hand to answer a question.

Question 15

Which of the following is TRUE regarding the enteric nervous system?

Accepted Answer

It regulates the function of the gastrointestinal tract independently of the CNS.

Question 16

Which of the following best describes the relationship between the brain and the enteric nervous system (ENS) in the gut-brain axis?

Accepted Answer

The brain and ENS communicate bidirectionally, influencing each other's function.

Question 17

Which of the following is a correct pairing of nervous system division and its primary function?

Accepted Answer

Autonomic nervous system – regulates internal organs and glands

Question 18

Which of the following best explains why humans do NOT have the largest brain of all mammals?

Accepted Answer

Humans have the largest brain relative to body size, but not in absolute size.

Question 19

Which of the following is a real-life example of the sympathetic nervous system in action?

Accepted Answer

Sweating and increased heart rate before giving a public speech

The Nervous System: Structure, Divisions, and Functions

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