Question 1

Which part of a motor neurone is responsible for transmitting impulses directly to the effector organ?

Accepted Answer

Axon

Question 2

What is the primary function of the myelin sheath surrounding an axon?

Accepted Answer

To insulate the axon and speed up impulse conduction

Question 3

Which structure in the eye is responsible for converting light energy into electrical nerve impulses?

Accepted Answer

Retina

Question 4

A patient is unable to distinguish colors but can see in dim light. Which retinal cells are most likely functioning normally?

Accepted Answer

Rods

Question 5

If the myelin sheath of a neuron is damaged, which of the following is most likely to occur?

Accepted Answer

Impulse conduction will slow down

Question 6

Which part of the eye is responsible for controlling the amount of light entering the eye?

Accepted Answer

Iris

Question 7

A person sees only black and white images even in bright light. Which cells in the retina are most likely malfunctioning?

Accepted Answer

Cones

Question 8

Which of the following best describes a 'mixed' nerve?

Accepted Answer

A nerve containing both sensory and motor neurones

Question 9

What is the main function of the cornea in the human eye?

Accepted Answer

To act as a transparent window allowing light into the eye

Question 10

Which area of the retina contains the highest concentration of cone cells?

Accepted Answer

Fovea

Question 11

If a person’s sensory neurones are damaged, which of the following symptoms would most likely occur?

Accepted Answer

Loss of sensation

Question 12

Which of the following best explains why the pupil appears black?

Accepted Answer

No light escapes from inside the eye

Question 13

Which of the following is TRUE about rod cells in the retina?

Accepted Answer

They function well in dim light

Question 14

Which structure forms synapses with other neurons and receives signals?

Accepted Answer

Dendrites

Question 15

Which of the following best describes the function of a neuromuscular junction?

Accepted Answer

It transmits impulses from motor neurons to muscle fibers

Question 16

If red, green, and blue cone cells are stimulated equally, what color is perceived?

Accepted Answer

White

Question 17

Which equation best represents the speed of nerve impulse conduction in a myelinated axon compared to an unmyelinated axon?

Accepted Answer

$v_{myelinated} > v_{unmyelinated}$

Question 18

A person suffers damage to the fovea. Which visual ability is most likely to be affected?

Accepted Answer

Color vision and sharp central vision

Question 19

Which of the following is the correct sequence for the transmission of a visual signal from the eye to the brain?

Accepted Answer

Cornea → Pupil → Retina → Optic nerve → Brain

Question 20

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

Accepted Answer

Myelin sheath allows impulses to jump between nodes (saltatory conduction)

Structure and Function of Neurons and the Human Eye

Study Guide - Practice Questions