Tag: human brain and sense organs

Quizzes (2) Questions (112)

Questions Related to human brain and sense organs

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

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

  1. No thermoregulation

  2. No vision

  3. No response when prickled with needles

  4. No memory
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The medulla oblongata controls vital autonomic functions. If destroyed, the body loses the ability to maintain these involuntary processes. The option regarding the prick reflex is the most commonly cited consequence in this context.

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

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

  1. Kidney

  2. Liver

  3. Heart

  4. Brain
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

The function of iris in the eyes of frog is to

  1. Refract the light rays

  2. Alter the size of the pupil

  3. Move the nictitating membrane

  4. Move the lens forward and backward
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

The iris of eye is 

  1. Photosensitive

  2. Chemoreceptor

  3. Both A and B

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Sclera

  2. Retinol

  3. Rhodopsin

  4. Melanin
Reveal answer Fill a bubble to check yourself
C Correct answer
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.