Biology Class 11 NCERT Solutions: Chapter 22 Chemical Coordination and Integration Part 3

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Q: 7. Which hormone deficiency is responsible for the following?

(A) Diabetes mellitus

(B) Goiter

(C) Cretinism

Answer

(A) Diabetes mellitus is characterized by abnormally high glucose levels in the blood due to the deficiency of hormone, called insulin.

(B) Goiter is characterised by an abnormal enlargement of the thyroid gland due to the deficiency of thyroxin hormone in the body.

(C) Cretinism is characterized by stunted growth in the baby due to the deficiency of thyroid hormone in the body.

Q: 8. Briefly mention the mechanism of action of FSH.

Answer:

Follicle stimulating hormone (FSH) is secreted by the pars distalis region of the anterior pituitary.

It regulates the development, growth, and reproductive processes of the human body. In the ovary, FSH stimulates the growth and maturation of ovarian follicle. As the follicle grows and matures, it releases an inhibitory hormone known as inhibin that ends the process of FSH production.

Action of FSH: Follicle stimulating hormone produces its effect by binding to its specific receptors present on the ovarian cell membrane.

Binding of FSH hormone to its receptor leads to the formation of hormone receptor complex. The formation of this complex leads to biochemical changes in the ovarian follicle, present in the ovary. The ovarian follicles mature and release a mature ovum in the fallopian tube for fertilization.

Q 8 Image of Follicle Stimulating Hormone

Q 8 Image of Follicle Stimulating Hormone

Q 8 Image of Follicle Stimulating Hormone

Q: 9. Match the following:

Table Shows the Match List
Table shows the match list

Column I

Column II

A

I

Hypothalamus

B

PTH

II

Thyroid

C

III

Pituitary

D

LH

Iv

Parathyroid

Table Shows the Correct Match List
Table shows the correct match list

Column I

Column I

A

I

Thyroid

B

PTH

II

Parathyroid

C

III

Hypothalamus

D

LH

Iv

Pituitary