Question

Select the answer with the correct matching of the structure, its location and function.

	Structure	Location	Function
1	Blind spot	Near the place where optic nerve leaves the eye	Rods and cones are present but inactive here
2	Eustachian tube	Anterior part of internal ear	Equalizes air pressure on either side of tympanic membrane
3	Cerebellum	Midbrain	Controls respiration and breathing
4	Hypothalamus	Forebrain	Controls body temperature, urge for eating and drinking

• A. 1
• B. 2
• C. 3
• D. 4
• E. Both A and B

Answer 1

The correct option is D 4

• The nerve impulses from the rods and cones are transmitted by nerve fibers across the retina to an area where the fibers converge and form the optic nerve. The area where the optic nerve passes through the retina is devoid of rods and cones and is known as the blind spot.
• The Eustachian tube is a tube that links the nasopharynx to the middle ear. It is a part of the middle ear. Under normal circumstances, the human Eustachian tube is closed, but it can open to let a small amount of air through to prevent damage by equalising pressure between the middle ear and the atmosphere.
• The cerebellum is the area of the hindbrain, that controls motor movement coordination, balance, equilibrium and muscle tone. The diencephalon is located between the cerebrum and midbrain. It consists of the thalamus and the hypothalamus.
• The hypothalamus is located below the thalamus, just above the brainstem and is part of the limbic system. The hormones produced by this area of the brain govern body temperature, thirst, hunger, sleep, circadian rhythm, moods, sex drive, and the release of other hormones in the body.

So, the correct answer is option D.