Revision Series | Science and Tech| Nervous system and hormones-2 | 80

July 28, 2023

Out of the following, which one does not affect the speed of conduction of nerve impulse.

(A) No. of ganglia
(B) Myelin sheath
(C) Axon diameter
(D) Temperature

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ANSWER : A

Name the multipolar neuron which is located entirely within the central nervous system.

(A) Motor neuron
(B) Efferent neuron
(C) Afferent neuron
(D) Interneuron

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ANSWER : D

In our body involuntary actions are controlled by:

(A) Medulla in Hindbrain
(B) Medulla in Forebrain
(C) Medulla in Spinal Cord
(D) Medulla in Midbrain

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ANSWER : A

What are Nissl bodies?

(A) Golgi bodies
(B) Lysosomes
(C) Cluster of rough endoplasmic reticulum
(D) Mitochondria

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ANSWER : C

Spinal Cord originates from which part of the brain?

(A) Cerebellum
(B) Medulla
(C) Pons
(D) Cerebrum

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ANSWER : B

Those reflex actions which involve brain are called

(A) Stimulus
(B) Cerebral reflexes
(C) Spinal reflexes
(D) Reflex arc

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ANSWER : B

Which of the given hormones regulate blood calcium and phosphate in the human body?

(A) Glucagon
(B) Parathyroid hormone
(C) Thyroxine
(D) Growth hormone

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ANSWER : B

Which hormone is responsible for the release of milk from the mammary gland?

(A) Adrenaline
(B) Thyroxine
(C) Progesterone
(D) Oxytocin

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ANSWER : D

Why iodised salt is useful for consumption?

(A) It controls the thyroid gland
(B) It increases resistance to diseases
(C) It improves digestion
(D) None of the above

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ANSWER : A

Hypothalamus is the basal part of which of the following?

(A) Forebrain
(B) Midbrain
(C) Hindbrain
(D) Mesencephalon

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ANSWER : A

The hypothalamus is the basal part of the diencephalon, forebrain and it regulates a wide spectrum of body functions. It contains several groups of neurosecretory cells called nuclei which produce hormones.

Which part of the pituitary is under the direct control of the hypothalamus?

(A) Posterior part
(B) Anterior part
(C) Dorsal part
(D) Ventral part

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ANSWER : A

The posterior pituitary is under the direct neural regulation of the hypothalamus. The pituitary gland is located in a bony cavity called Sella turcica and is attached to the hypothalamus by a stalk.

Which of the following hormone is not secreted by the pars distalis region of the pituitary?

(A) Prolactin
(B) Growth hormone
(C) Follicle-stimulating hormone
(D) Oxytocin

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ANSWER : D

Explanation: The pars distalis region of pituitary produces growth hormone, prolactin, thyroid-stimulating hormone, adrenocorticotrophic hormone, luteinizing hormone, and follicle-stimulating hormone.

Which of the following diseases is hard to diagnose?

(A) Gigantism
(B) Goitre
(C) Dwarfism
(D) Acromegaly

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ANSWER : D

Explanation: Excess secretion of growth hormones in adults especially in middle age can result in severe disfigurement which is known as Acromegaly, which may lead to serious complications. The disease is hard to diagnose in the early stages and often goes undetected for many years.

Which of the following hormones are known as gonadotrophins?

(A) LH and Oxytocin
(B) LH and vasopressin
(C) LH and FSH
(D) FSH and Oxytocin

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ANSWER : C

Explanation: LH and FSH stimulate the gonadal activity and are therefore referred to as gonadotrophins. In males, LH stimulates the synthesis and secretion of hormones called androgens from the testis.

Which of the following is not a function of LH and FSH in females?

(A) Induces ovulation
(B) Secretion of androgens
(C) Maintaining corpus luteum
(D) Stimulates the growth of follicles

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ANSWER : B

Explanation: FSH stimulates the growth and development of the ovarian follicles in females. LH induces ovulation of fully mature follicles and maintains the corpus luteum, formed from the remnants of Graafian follicles after ovulation in females.