Tag: human brain and sense organs

Questions Related to human brain and sense organs

Which is not part of brain stem

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. Cerebrum

  2. Medulla oblongata

  3. Pons varolii

  4. Corpora quadrigemina

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Correct Option: A

Cerebrum is part of

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. Mesencephalon

  2. Metencephalon

  3. Prosencephalon

  4. Myelencephalon

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Correct Option: C

Activities like running, talking and typing are controlled by 

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. Cerebellum

  2. Pons

  3. Medulla oblongata

  4. Mid brain

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Correct Option: A

Salivation is under control of

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. Cerebellum

  2. Hypothalamus

  3. Medulla oblongata

  4. Mesencephalon

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Correct Option: C

If medulla oblongata is destroyed then which of the following functions will be affected?

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. No thermoregulation

  2. No vision

  3. No response when prickled with needles

  4. No memory

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Correct Option: C

In human brain two hemispheres are connected by bundle of fiber which is know as _______________.

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. Medulla oblongata

  2. Cerebrum

  3. Cerebellum

  4. Corpus callosum

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Correct Option: D

Choose the correct answer from the alternatives given.
To which of the following organ/blood is supplied by the internal carotid artery?

biology human brain and sense organs the brain nervous system in humans central nervous system

  1. Kidney

  2. Liver

  3. Heart

  4. Brain

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Correct Option: D
Explanation:

The brain forms only 2% of the body but uses up to 20% of the oxygen. It is given the top priority during the distribution of oxygen-rich blood. The internal carotid arteries and vertebral arteries carry oxygen-rich blood from the heart to the brain. 

So, the correct option is 'Brain'.

The function of iris in the eyes of frog is to

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Refract the light rays

  2. Alter the size of the pupil

  3. Move the nictitating membrane

  4. Move the lens forward and backward

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Correct Option: B
Explanation:

Smooth muscle cells of the frog iris sphincter contain rhodopsin and contract in response to light. It is the colored part of the eye, which regulates the size of the pupil controlling the entry of light into the eye.

The iris of eye is 

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Photosensitive

  2. Chemoreceptor

  3. Both A and B

  4. All of the above

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Correct Option: A
Explanation:

The colored part of the eye is called as the iris. It controls light levels inside the eye. The round opening in the center of the iris is called as the pupil. It is photosensitive in nature and is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size depending on the presence or absence of light.
Therefore, the correct answer is option A.

In the chemistry of vision in mammals, the photosensitive substance is called as

biology human brain and sense organs introduction to sense organs eyes and their function the structure and function of the eye

  1. Sclera

  2. Retinol

  3. Rhodopsin

  4. Melanin

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Correct Option: C
Explanation:

Rhodopsin, also known as visual purple, is a light-sensitive receptor protein. It is a biological pigment in photoreceptor cells of the retina. 

Rhodopsin is the primary pigment found in rod photoreceptors. Rhodopsins belong to the G-protein-coupled receptor (GPCR) family. This protein is necessary for normal vision, particularly in low-light conditions. It allows night vision and is extremely sensitive to light. Exposed to a spectrum of light, the pigment immediately bleaches, and it takes about 30 minutes to regenerate fully, but most of the adaptation occurs within the first five or ten minutes in the dark.