Neural Control and Coordination- Quiz 11

How do parasympathetic neural signals affect the working of the heart ?

• Reduce both heart rate and cardiac output.

• Heart rate is increased without affecting the cardiac output.

• Both heart rate and cardiac output increase.

• Heart rate decreases but cardiac output increases.

Which one of the following statements is not correct ?

• Retinal is the light absorbing portion of visual photo pigments.

• In retina the rods have the photopigment rhodopsin while cones have three different photopigments.

• Retinal is a derivative of Vitamin C.

• Rhodopsin is the purplish red protein present in rods only.

Which one of the following is not a refractive medium of the eye?

• Lens

• Vitreous humour

• Aqueous humour

• Pupil

In mammalian eye, the ‘fovea’ is the center of the visual field, where

• Only rods are present

• More rods than cones are found

• High density of cones occur, but has no rods

• The optic nerve leaves the eye

The fovea of eye

• has the lowest light threshold

• is the region of highest visual activity

• contains only green and red cones

• contains only rods

Cavity of vitreous humour (gel) is –

• Behind the lens

• In front of lens

• Between choroid and retina

• Between choroid and sclera

Cavity of aqueous humour (watery fluid) is –

• Behind the lens

• Between choroid and retina

• Between cornea and lens

• Between lens and retina

Which of the following options is wrong?

• Eye muscles are attached with sclera

• Visual purple is concerned with dim light, while visual violet is concerned with bright light

• The colour differentiation is done by cones

• None

If Chlorolab of retina is damaged which colour can not be visualised?

• Green

• Red

• Yellow

• Many colours

Which of the following statements is not correct ?

• In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction

• An action potential in an axon does not move backward because the segment behind is in a refractory phase

• Depolarisation of axon causes outside negatively and inside positively charged

• Rods are very sensitive and contribute to daylight vision