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

by aglasem
August 25, 2021
in 11th Class
Reading Time: 1 min read
0
NCERT Solutions

NCERT Solutions Class 11 Biology Chapter 22 Chemical Coordination And Integration– Here are all the NCERT solutions for Class 11 Biology Chapter 22. This solution contains questions, answers, images, explanations of the complete chapter 22 titled Chemical Coordination And IntegrationBiology taught in Class 11. If you are a student of Class 11 who is using NCERT Textbook to study Biology, then you must come across chapter 22 Chemical Coordination And Integration after you have studied the lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 11 Biology Chapter 22 Chemical Coordination And Integration in one place.

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NCERT Solutions Class 11 Biology Chapter 22 Chemical Coordination And Integration

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Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Biology for Class 11 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.

For a better understanding of this chapter, you should also see summary of Chapter 22 Chemical Coordination And Integration , Biology, Class 11.

Class 11
Subject Biology
Book Biology
Chapter Number 22
Chapter Name

Chemical Coordination And Integration

NCERT Solutions Class 11 Biology chapter 22 Chemical Coordination And Integration

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Class 11, Biology chapter 22, Chemical Coordination And Integration solutions are given below in PDF format. You can view them online or download PDF file for future use.

Chemical Coordination And Integration Download

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Question & Answer

Q.1: Define the following:
(a) Exocrine gland 
(b) Endocrine gland 
(c) Hormone

Ans : (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.

Q.2: Diagrammatically indicate the location of the various endocrine glands in our body.

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

Q.3: 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

Ans : (a) Hypothalamus: Hormones secreted by the hypothalamus include: (1) Releasing hormones: These hormones stimulate the secretions of the pituitary hormone. Examples of these hormones are: (i) Gonadotrophin-releasing hormone (ii) Thyrotrophin-releasing hormone (iii) Somatotropin-releasing hormone (iv) Adrenocorticotrophin-releasing hormone (2) Inhibiting hormones: These hormones inhibit the secretions of the pituitary hormone. Examples of these hormones are: (i) Somatostatin (ii) Growth-inhibiting hormone (iii) Melanocyte-inhibiting hormone (b) Pituitary: The pituitary gland has two components i.e., adenohypophysis and neurohypophysis. Hormones secreted by the adenohypophysis are: (i) Growth hormone (GH) (ii) Prolactin (iii) Thyroid-stimulating hormone (TSH) (iv) Adrenocorticotrophic hormone (ACTH) (v) Luteinizing hormone (LH) (vi) Follicle-stimulating hormone (FSH) (vii) Melanocyte-stimulating hormone (MSH) Hormones secreted by the neurohypophysis are: (i) Oxytocin (ii) Vasopressin (c) Thyroid: The thyroid gland secretes three hormones namely, thyroxin, triiodothyronin, and calcitonin. (d) Parathyroid: The parathyroid gland secretes a hormone known as the parathyroid hormone. (e) Adrenal: The adrenal gland is divided into two parts, the outer adrenal cortex and the inner adrenal medulla. Hormones of adrenal cortex include the following: (i) Mineralocorticoids: The hormone secreted is known as aldosterone. (ii) Glucocorticoids: The hormone secreted is cortisol. Hormones of adrenal medulla are adrenaline and nor-adrenalin. (f) Pancreas: Hormones secreted by the pancreas are insulin and glucagon. (g) Testis: The hormone secreted by the testis is testosterone. (h) Ovary: The hormone secreted by the ovary includes estrogen and progesterone. (i) Thymus: Hormones secreted by the thymus are thymosins. (j) Atrium: The walls of the atrium secrete atrial natriuretic factor. (k) Kidney: The hormone secreted by kidney is erythropoietin. (l) G-l tract: The hormones secreted by the G-l tract are Gastrin, secretin, cholecystokinin (CCK), and gastric inhibitory peptide (GIP).

Q.4: Fill in the blanks:

Ans : (a) Pituitary (b) Thyroid (c) Adrenal (d) Ovary, Testis (e)Melanocyte

Q.5: 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

Ans : (a) Parathyroid hormone (PTH) — The parathyroid hormone is secreted by the parathyroid gland. Its main function is to increase the level of calcium in blood. It promotes the reabsorption of calcium from nephrons and also, promotes the absorption of calcium from digested food. Hence, it plays an important role in maintaining calcium balance in the body. (b) Thyroid hormones — Thyroid hormones such as thyroxine, triiodothyronin, and thyrocalcitonin are secreted by the thyroid gland. Thyroxine maintains the basal metabolic rate of the body and regulates the carbohydrate, fat, and protein metabolism. Water and electrolyte balance is also maintained by thyroid hormones. Thyrocalcitonin or calcitonin lowers calcium level in blood plasma. It plays a significant role in calcium levels along with parathyroid hormone. (c) Thymosins — Thymosin is secreted by the thymus gland. It plays a major role in protecting the body against infectious agents. It helps in the differentiation of T-lymphocytes and also promotes the reproduction of antibodies. Hence, it provides both cell-mediated and humoral immunity. Thymosins also help in the development of sex glands. (d) Androgens — The leydig cells of testis produce androgens such as testosterone. Testosterone is a male sex hormone that regulates the development of secondary sex characteristics such as facial hair, hoarse voice, development of reproductive organ, etc. Androgens also regulate the development, maturation, and functions of various male accessory organs such as epididymis and prostate glands. It stimulates spermatogenesis and formation of mature sperms. It also influences male sexual behaviour. (e) Estrogens- Estrogen is the female sex hormone that controls the development of secondary sex characteristics such as enlargement of breasts and development of female reproductive organs. It plays a role in the development, growth and maturation of female secondary characteristics. It also helps in the development of growing ovarian follicles. It influences female sexual behaviour. (f) Insulin and glucagon — Glucagon and insulin are secreted by cells of pancreas. They regulate the blood glucose level in the body. a-cells secrete glucagon that maintain a normal blood glucose level in the body, whereas ß-cells secrete insulin that regulates the storage of glycogen in the liver. Function of insulin — Insulin stimulates glycogenesis (conversion of glucose to glycogen). The rapid conversion of glucose from the blood to glycogen in hepatocytes and adipocytes results into a decreased glucose level. Insulin also prevents the formation of glucose from non-carbohydrate substances such as proteins and fats. Hence, it acts as a regulator of carbohydrate metabolism. Function of glucagon — The main function of the glucagon is to increase the level of glucose when there is a deficiency of glucose in the body. This process is known as glycogenolysis.

NCERT / CBSE Book for Class 11 Biology

You can download the NCERT Book for Class 11 Biology in PDF format for free. Otherwise you can also buy it easily online.

  • Click here for NCERT Book for Class 11 Biology
  • Click here to buy NCERT Book for Class 11 Biology

All NCERT Solutions Class 11

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You can also check out NCERT Solutions of other classes here. Click on the class number below to go to relevant NCERT Solutions of Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

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