NCERT Solutions for Class 11 Biology Chapter 22 - Chemical Coordination And Integration

1. Define the following:

(a) Exocrine Gland

Ans: Exocrine glands, such as sebaceous glands, sweat glands, salivary glands, and intestinal glands, secrete their secretions on the surface or into a specific region via ducts in order to conduct a metabolic function. 

(b) Endocrine Gland

Ans: The endocrine gland is a unique gland (from the epithelium that forms it) that secretes informational molecules or hormones that are injected into the venous blood or lymph to reach the target organ because there is no duct connecting the gland to the target organ. As a result, endocrine glands, such as the thyroid gland, are sometimes known as ductless glands.

(c) Hormone

Ans: Hormone is a chemical produced by an endocrine gland or a specialized nerve cell and released in very minute amounts into the bloodstream to control the growth or function of a specific tissue organ in a distant area of the body, such as insulin.

2. Diagrammatically Indicates the Location of the Various Endocrine Glands in Our Body.

Ans: (Image Will be uploaded Soon)

3. List the Hormones Secreted by the Following:

a) Hypothalamus

Ans: Two sorts of hormones are produced by the hypothalamus: releasing hormones (that stimulate secretion of pituitary hormones) and inhibiting hormones (that inhibit secretion of pituitary hormones.

These Hormones Include:

1. Thyrotropin-releasing hormone Adren

2. Corticotropin-releasing hormone

3. Follicle-stimulating hormone-releasing hormone

4. Luteinizing hormone-releasing hormone

5. Growth hormone-releasing hormone

6. Growth inhibiting hormone

7. Prolactin releasing hormone

8. Prolactin inhibiting hormone

9. Melanocyte stimulating hormone-releasing hormone

10. Melanocyte stimulating hormone-inhibiting hormone.

b) Pituitary

Ans: Different hormones are secreted by different regions of the pituitary gland.         

The Anterior Lobe of the Pituitary Gland Secretes the Following Hormones:

1. Follicle-stimulating hormone

2. Luteinizing hormone

3. Thyroid-stimulating hormone

4. Adrenocorticotropic hormone

5. Somatotrophic or Growth hormone

6. Prolactin hormone or Luteotropic hormone.

The middle (intermediate) lobe of the pituitary gland: Melanocyte stimulating hormone.

The Posterior Lobe of the Pituitary:

1. Oxytocin

2. Vasopressin or antidiuretic hormone.

c) Thyroid

Ans: Thyroid secretes Thyroxine or tetraiodothyronine, Triiodothyronine, and Calcitonin hormones.

d) Parathyroid

Ans: Parathyroid gland secretes a single hormone called parathormone (PTH) or Collip’s hormones.

e) Adrenal

Ans: Adrenal glands have two regions, namely, the outer adrenal cortex and the inner adrenal medulla. Both these regions secrete different hormones.

Hormones of the Adrenal Cortex Are Grouped into Three Categories:

1. Glucocorticoids, e.g., cortisol

2. Mineralocorticoids, e.g., aldosterone

3. Sexcorticoids e.g. testosterone.

 The Adrenal Medulla Secretes Two Hormones

1. Epinephrine (adrenaline)

2. Nor-epinephrine (nor-adrenaline).

f) Pancreas

Ans: Pancreas secretes Insulin, Glucagon, and Somatostatin hormones.

g) Testis

Ans: Testis secretes androgens hormone.

h) Ovary

Ans: Ovary secretes Estrogens such as estradiol, Progesterone, and Relaxin.

i) Thymus

Ans: Thymus secretes thymosin hormone.

j) Atrium

Ans: Atrium secretes atrial natriuretic factor (ANF).

k) Kidney

Ans: Kidney secretes Renin and Erythropoietin hormones.

l) G-I Tract.

Ans: G.I. tract secretes the following hormones:

1. Gastrin

2. Secretin

3. Cholecystokinin

4. Enterocrinin

5. Duocrinin

6. Villikinin

4. Fill in the Blanks:

Hormones                                                   Target Gland

1. Hypothalamic hormones                   ........................

2. Thyrotrophin (TSH)                             ........................

3. Corticotropin (ACH)                          ........................

4. Gonadotrophins (LH, FSH)                 ........................

5. Melanotropin (MSH)                        ........................

Ans:

1. Pituitary

2. Thyroid

3. Adrenal cortex

4. Gonads – Tests in male and ovaries in female

5. Skin.

5. Write short notes on the functions of the following hormones:

Parathyroid Hormones (PTH)

Ans: Parathyroid hormone raises calcium levels while lowering phosphate levels in the blood.

Thyroid Hormones

Ans: Thyroxine, triiodothyronine, and calcitonin are the three hormones secreted by the thyroid gland. Thyroxine and triiodothyronine regulate the body's overall metabolism, encourage tissue development, and induce tissue differentiation. Calcitonin is a hormone that controls calcium levels in the blood.

Thymosin

Ans: Thymosin is produced by the thymus gland. Cell division is accelerated, T-lymphocyte growth and differentiation are stimulated, and sexual maturity is accelerated.

Androgens

Ans: The testis secretes androgens. They influence male sexual behavior and sex drive by stimulating the development of the male reproductive system, the production of sperm, and the development of male accessory sex characteristics.

Estrogens

Ans: Estrogens are produced by the ovaries. They encourage the female reproductive system to mature and become fully functional, as well as the differentiation of ova and the development of accessory sex characteristics.

Insulin and Glucagon.

Ans: Insulin is produced in the pancreas by the -cells. It reduces blood glucose levels and stimulates protein and fat synthesis. The a-cells of the pancreas produce glucagon. It causes a rise in blood glucose levels.

 6. Give an example(s) of

1. Hyperglycemic Hormone and Hypoglycemic Hormone

 Ans: Parathormone (PTH)

2. Hypercalcemic Hormone

 Ans: Glucagon, Insulin

3. Gonadotrophic Hormones

 Ans: Follicle-stimulating hormone (FSH) and Luteinizing hormone (LH)

4. Progestational Hormone

 Ans: Progesterone

5. Blood Pressure-Lowering Hormone

 Ans: Atrial natriuretic factor

6. Androgens and Estrogens.

 Ans: Testosterone and Estradiol.

7. Which Hormonal Deficiency is Responsible for the Following?

1. Diabetes Mellitus

Ans: Diabetes mellitus is characterized by excessively high blood glucose levels caused by a lack of the hormone insulin.

2. Goiter

 Ans: Goitre is a condition in which the thyroid gland enlarges abnormally owing to a lack of thyroxine hormone in the body.

3. Cretinism.

  Ans: Cretinism is a condition in which a baby's development is slowed owing to a lack of thyroid hormone in the body.

8. Briefly Mention the Mechanism of Action of FSH.

Ans: (Follicle-stimulating hormone) is a glycoprotein that is lipid insoluble and so cannot penetrate target cells. It forms a hormone-receptor complex by binding to particular receptor molecules on the cell membrane's surface. The enzyme adenylate cyclase is released from the receptor site as a result of this combination. From ATP, this enzyme produces cell cyclic adenosine monophosphate (cAMP). The cAMP stimulates the cell's existing enzyme system. The metabolic processes in the cell are accelerated as a result of this. The hormone is referred to as the first messenger, whereas cAMP is referred to as the second messenger. The hormone-receptor complex alters the permeability of the cell membrane to allow items to pass across it more easily. As the cell obtains the required ingredients, its actions grow.

Question 9:

Column I                      Column II

1. T4                        (i) Hypothalamus

2. PTH                     (ii) Thyroid

3. GnRH                  (iii) Pituitary

4. LH                        (iv) Parathyroid.

Ans:

1. T4– Thyroid

2. PTH – Parathyroid

3. GnRH – Hypothalamus

4. LH- Pituitary

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