The Human Nervous System Quiz

Question 1

What are the two main divisions of the human nervous system?

Accepted Answer

Central nervous system (CNS) and peripheral nervous system (PNS)

Answer

Brain and spinal cord only

Answer

Sensory system and motor system

Answer

Voluntary system and involuntary system

Question 2

What are neurons?

Accepted Answer

Specialised cells that carry electrical signals (impulses) through the nervous system

Answer

Blood cells that carry oxygen

Answer

Hormones released by the brain

Answer

Cells that store memories

Question 3

What are the three types of neuron?

Accepted Answer

Sensory, relay (interneuron), and motor neurons

Answer

Fast, slow, and medium neurons

Answer

Input, processing, and output neurons

Answer

Upper, middle, and lower neurons

Question 4

What is a synapse?

Accepted Answer

The gap between two neurons where chemical neurotransmitters pass the signal across

Answer

The junction between two bones

Answer

The fatty sheath around an axon

Answer

The receptor at the end of a sensory neuron

Question 5

What is a reflex action?

Accepted Answer

A rapid, automatic, involuntary response to a stimulus that does not require conscious thought

Answer

A slow, conscious response to a stimulus

Answer

A learned behaviour repeated over time

Answer

A response controlled directly by the brain

Question 6

What is the correct order of a reflex arc?

Accepted Answer

Receptor → sensory neuron → relay neuron → motor neuron → effector

Answer

Effector → spinal cord → receptor → muscle

Answer

Brain → motor neuron → receptor → sensory neuron

Answer

Stimulus → brain → motor neuron → muscle

Question 7

What is the function of the cerebrum?

Accepted Answer

The largest part of the brain responsible for conscious thought, memory, learning, personality, and voluntary movement

Answer

Controls heart rate and breathing automatically

Answer

Controls balance and muscle coordination

Answer

Connects the brain to the spinal cord

Question 8

What is the cerebellum responsible for?

Accepted Answer

Balance, coordination, and fine motor control

Answer

Conscious thought and reasoning

Answer

Regulating heart rate and breathing

Answer

Processing emotions

Question 9

What does the myelin sheath do?

Accepted Answer

Insulates the axon and speeds up the transmission of nerve impulses

Answer

Produces neurotransmitters

Answer

Connects neurons at synapses

Answer

Stores neurotransmitters

Question 10

What is the difference between the nervous system and the endocrine (hormonal) system?

Accepted Answer

The nervous system uses electrical impulses for rapid responses; the endocrine system uses hormones in blood for slower, longer-lasting effects

Answer

The nervous system is slower; hormones are faster

Answer

They are identical in function

Answer

The nervous system controls growth; hormones control movement

Question 11

What is a receptor in the nervous system?

Accepted Answer

A specialised cell or organ that detects stimuli and converts them into electrical impulses

Answer

A neuron in the spinal cord

Answer

A muscle that responds to nerve signals

Answer

A gland that releases hormones

Question 12

What is the medulla oblongata responsible for?

Accepted Answer

Controlling involuntary vital functions like heart rate, breathing, and blood pressure

Answer

Processing visual information

Answer

Higher cognitive functions

Answer

Memory formation

Question 13

What does the pupil reflex demonstrate?

Accepted Answer

An involuntary reflex where pupil size adjusts automatically to changes in light intensity

Answer

Learned behaviour in response to light

Answer

The brain's conscious control of vision

Answer

How the eye moves to track objects

Question 14

What is a neurotransmitter?

Accepted Answer

A chemical messenger released at a synapse that transmits signals between neurons

Answer

A type of nerve impulse

Answer

An electrical signal in a neuron

Answer

A hormone produced by the pituitary gland

Question 15

Why do reflexes bypass the brain?

Accepted Answer

To produce a faster response — routing signals only through the spinal cord reduces response time

Answer

The brain is too busy to respond

Answer

The brain cannot process pain signals

Answer

Reflexes only work during sleep

Question 16

What is the function of the hypothalamus?

Accepted Answer

Links the nervous system to the endocrine system; regulates body temperature, hunger, thirst, and sleep

Answer

Controls voluntary movements

Answer

Coordinates balance

Answer

Processes language

Question 17

What is the peripheral nervous system divided into?

Accepted Answer

Somatic (voluntary) and autonomic (involuntary) nervous systems

Answer

Cerebrum and cerebellum

Answer

Sensory and CNS systems

Answer

Upper and lower motor neurons

Question 18

How do drugs like caffeine affect the nervous system?

Accepted Answer

They alter the action of neurotransmitters at synapses, affecting nerve impulse transmission

Answer

They destroy neurons permanently

Answer

They increase the number of neurons

Answer

They slow the speed of light-detecting cells in the eye

Question 19

What is the function of the spinal cord?

Accepted Answer

To relay nerve signals between the brain and the body, and to coordinate spinal reflexes

Answer

Only to support the backbone structurally

Answer

To produce cerebrospinal fluid only

Answer

To store memories

Question 20

What happens at the synapse when a nerve impulse arrives?

Accepted Answer

Vesicles release neurotransmitters into the cleft; they bind to receptors on the next neuron and generate a new impulse

Answer

The electrical signal jumps directly across the gap

Answer

The neurons physically touch and the signal passes by contact

Answer

Calcium ions flow directly between neurons