Which eye condition is characterized by the lens becoming opaque, resulting in reduced vision?

Cataract

What role do the iris and pupil play in regulating vision?

The iris controls the size of the pupil, which regulates the amount of light that enters the eye, thus affecting vision in varying light conditions.

True or False: Rod cells in the retina are responsible for color vision.

False. Rod cells are sensitive to dim light but do not detect color; cone cells are responsible for color vision.

What is the primary function of the cochlea in the inner ear?

The cochlea converts mechanical vibrations into electrical signals through sensory cells, which are then interpreted as sound by the brain.

Fill in the blank: Myopia, also known as ___, occurs when distant objects appear blurred because the lens is too ___ .

How does the structure of the outer ear contribute to the process of hearing?

The outer ear, consisting of the pinna and auditory canal, collects sound waves and directs them toward the eardrum, initiating the hearing process.

What are the main types of sensory receptors and their respective stimuli?

Types of sensory receptors explained.

• Mechanoreceptors sense touch.

• Chemoreceptors detect taste.

• Photoreceptors respond to light.

Riddle: I help you see in the dark and am sensitive to dim light. I am not colorful but help you detect shapes. What am I?

Rod cells

What is the significance of the vestibule in maintaining body balance?

The vestibule aids body balance.

• Houses sensory cells for balance.

• Detects head position and motion.

• Essential for static equilibrium.

Fill in the blank: The ___ is the part of the eye that contains both rods and cones, responsible for converting light into nerve impulses.

Retina

Explain the difference between dark adaptation and light adaptation.

Eyes adjust to light levels.

• Dark adaptation increases sensitivity.

• Light adaptation decreases sensitivity.

• Both are essential for vision.

True or False: The eustachian tube connects the inner ear to the throat.

False. The eustachian tube connects the middle ear to the throat.

What are the two main parts of the inner ear and their primary functions?

The cochlea, which is responsible for hearing, and the semicircular canals, which help maintain balance.