NCERT Solutions for Class 11 Biology Chapter 22

Chemical Coordination and Integration Class 11

Chapter 22 Chemical Coordination and Integration Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 341

Q1 :  

Define the following:

(a) Exocrine gland

(b) Endocrine gland

(c) Hormone


Answer :

(a) Exocrine glands: Glands that discharge secretions into ducts are known as exocrine glands. Sebaceous gland in the skin, salivary gland in the buccal cavity, etc. are examples of exocrine glands.

(b) Endocrine glands: Glands that do not discharge their secretions into ducts are known as endocrine glands. Instead, these glands discharge their secretions directly into the blood. Pituitary gland, thyroid gland, adrenal gland, etc. are examples of endocrine glands.

(c) Hormones: Hormones are chemical messengers that regulate physiological processes in living organisms. They act upon specific cells/tissues/organs which are called target cells/tissues/organs.

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Q2 :  

Diagrammatically indicate the location of the various endocrine glands in our body.


Answer :

The location of various endocrine glands in the human body can be illustrated as follows:

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Q3 :  

List the hormones secreted by the following:

(a) Hypothalamus (b) Pituitary (c) Thyroid

(d) Parathyroid (e) Adrenal (f) Pancreas

(g) Testis (h) Ovary (i) Thymus

(j) Atrium (k) Kidney (l) G-I Tract


Answer :

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Q4 :  

Fill in the blanks:

Hormones Target gland

(a) Hypothalamic hormones __________________

(b) Thyrotrophin (TSH) __________________

(c) Corticotrophin (ACTH) __________________

(d) Gonadotrophins (LH, FSH) __________________

(e) Melanotrophin (MSH) __________________


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Q5 :  

Write short notes on the functions of the following hormones,

(a) Parathyroid hormone (PTH)

(b) Thyroid hormones

(c) Thymosins

(d) Androgens

(e) Estrogens

(f) Insulin and Glucagon


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Q6 :  

Give example(s) of:

(a) Hyperglycemic hormone and hypoglycemic hormone

(b) Hypercalcemic hormone

(c) Gonadotrophic hormones

(d) Progestational hormone

(e) Blood pressure lowering hormone

(f) Androgens and estrogens


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Q7 :  

Which hormone deficiency is responsible for the following?

(a) Diabetes mellitus

(b) Goitre

(c) Cretinism


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Q8 :  

Briefly mention the mechanism of action of FSH.


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Q9 :  

Match the following:

Column I

Column II

a

T4

i

Hypothalamus

b

PTH

ii

Thyroid

c

GnRH

iii

Pituitary

d

LH

iv

Parathyroid


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