Chapter 21 Neural Control And Coordination

Question 1. Chemicals which are released at the synaptic junction are called

(a) Hormones

(b) Neurotransmitters

(c) Cerebrospinal fluid

(d) Lymph

Question 2. Potential difference across resting membrane is negative. This is due to differential distribution of the following ions

(a) $Na^+$ and $K^+$

(b) $CO_3^{++}$ and $CI^-$

(c) $Ca^{++}$ and $Mg^{++}$

(d) $Ca^{++}$ and $CI^-$

Question 3. Resting membrane potential is maintained by

(a) Hormones

(b) Neurotransmitters

(c) Ion pump

(d) None of the above

Question 4. The function of our visceral organs is controlled by

(a) Sympathetic and somatic neural system

(b) Sympathetic and para sympathetic neural system

(c) Central and somatic nervous system

(d) None of the above

Question 5. Which of the following is not involved in Knee-jerk reflex?

(a) Muscle spindle

(b) Motor neuron

(c) Brain

(d) Interneurons

Question 6. An area in the brain which is associated with strong emotions is

(a) Cerebral cortex

(b) Cerebellum

(c) Limbic system

(d) Medulla

Question 7. Mark the vitamin present in Rhodopsin

(a) Vit A

(b) Vit B

(c) Vit C

(d) Vit D

Question 8. Human eyeball consists of three layers and it encloses

(a) Lens, iris, optic nerve

(b) Lens, acquous humor and vitreous humor

(c) Cornea, lens, iris

(d) Cornea, lens, optic nerve

Question 9. Wax secreting gland present in the ear canal is called

(a) Sweat gland

(b) Prostate gland

(c) Cowper’s gland

(d) Ceruminous gland

Question 10. The part of internal ear responsible for hearing is

(a) Cochlea

(b) Semicircular canal

(c) Utriculus

(d) Sacculus

Question 11. The organ of corti is a structure present in

(a) External ear

(b) Middle ear

(c) Semi circular canal

(d) Cochlea

Question 1. Rearrange the following in the correct order of involvement in electrical impulse movement-

Synaptic knob, dendrites, cell body, Axon terminal, Axon

Question 2. Comment upon the role of ear in maintaining the balance of the body and posture.

Question 3. Which cells of the retina enable us to see coloured objects around us?

Question 4. Arrange the following in the order of reception and transmission of sound wave from the ear drum:

Cochlear nerve, external auditory canal, ear drum, stapes, incus, malleus, cochlea.

Question 5. During resting potential, the axonal membrane is polarised, indicate the movement of +ve and –ve ions leading to polarisation diagrammatically.

Question 6. Name the structures involved in the protection of the brain.

Question 7. Our reaction like aggressive behaviour, use of abusive words, restlessness etc. are regulated by brain, name the parts involved.

Question 8. What do grey and white matter in the brain represent?

Question 9. Where is the hunger centre located in human brain?

Question 10. Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?

Question 11. While travelling at a higher altitude, a person complains of dizziness and vomiting sensation. Which part of the inner ear is disturbed during the journey?

Question 12. Complete the statement by choosing appropriate match among the following -

a. Resting potential

b. Nerve impulse

c. Synaptic cleft

d. Neurotransmitters

i. chemicals involved in the transmission of impulses at synapses.

ii. gap between the pre synaptic and post synaptic neurons

iii. electrical potential difference across the resting neural membrane

iv. an electrical wave like response of a neuron to a stimulation.

Question 1. The major parts of the human neural system is depicted below. Fill in the empty boxes with appropriate words.

Question 2. What is the difference between electrical transmission and chemical transmission?

Question 3. Neural system and computers share certain common features. Comment in five lines. (Hint: CPU, input-output devices).

Question 4. If someone receives a blow on the back of neck, what would be the effect on the person’s CNS?

Question 5. What is the function ascribed to Eustachian tube?

Question 6. Label the following parts in the given diagram using arrow.

a. Aqueous chamber

b. Cornea

c. Lens

d. Retina

e. Vitreous chamber

f. Blind spot

Question 1. Explain the process of the transport and release of a neurotransmitter with the help of a labelled diagram showing a complete neuron, axon terminal and synapse.

Question 2. Name the parts of human forebrain indicating their respective functions.

Question 3. Explain the structure of middle and internal ear with the help of diagram.