{"id":120339,"date":"2022-05-09T17:49:11","date_gmt":"2022-05-09T12:19:11","guid":{"rendered":"https:\/\/www.mapsofindia.com\/my-india\/?p=120339"},"modified":"2022-05-09T17:49:11","modified_gmt":"2022-05-09T12:19:11","slug":"chapter-22-chemical-coordination-and-integration-questions-and-answers-ncert-solutions-for-class-11-biology","status":"publish","type":"post","link":"https:\/\/www.mapsofindia.com\/my-india\/education\/chapter-22-chemical-coordination-and-integration-questions-and-answers-ncert-solutions-for-class-11-biology","title":{"rendered":"Chapter 22 – Chemical Coordination and integration Questions and Answers: NCERT Solutions for Class 11 Biology"},"content":{"rendered":"

1. Define the following:
\n(a) Exocrine gland
\n(b) Endocrine gland
\n(c) Hormone<\/h2>\n

Solution:
\n1. Exocrine gland \u2013 These glands liberate their secretions into ducts conveying either on the surface of the body or to particular organs of the body
\n2. Endocrine gland \u2013 These ductless glands liberate their secretions into the bloodstream, conveying it to target organs located at a distance
\n3. Hormone \u2013 It is a non-nutrient chemical which serves as a intercellular messenger and is secreted in trace amounts<\/h3>\n

2. Diagrammatically indicate the location of the various endocrine glands in our body.
\nSolution:
\nThe diagram indicating the location of the various endocrine glands in our body are:<\/p>\n

\"\"<\/p>\n

3. List the hormones secreted by the following:
\n(a) Hypothalamus
\n(b) Pituitary
\n(c) Thyroid
\n(d) Parathyroid
\n(e) Adrenal
\n(f) Pancreas
\n(g) Testis
\n(h) Ovary
\n(i) Thymus
\n(j) Atrium
\n(k) Kidney
\n(l) G-I Tract<\/h2>\n

Solution:
\nThe hormones secreted by the following structures are as follows:
\nName of the structure
\nHormone secreted<\/h3>\n

Hypothalamus
\nReleasing hormone
\nInhibiting hormone<\/h3>\n

Adrenocorticotropin-releasing hormone (ARH)
\nThyrotropin-releasing hormone (TRH)
\nLutenising hormone-releasing hormone (LH-RH)
\nFollicle-stimulating hormone-releasing hormone (FSH \u2013 RH)
\nProlactin-releasing hormone (PRH)
\nGrowth hormone \u2013 releasing hormone
\nMelanocyte stimulating hormone \u2013 releasing hormone
\nGrowth inhibiting hormone
\nProlactin inhibiting hormone
\nMelanocyte stimulating hormone \u2013 inhibiting hormone
\nPituitary
\nNeurohyophysis \u2013
\nOxytocin
\nAnti-diuretic hormone (Vasopressin)
\nAdenohypophysis \u2013
\nFollicle-stimulating hormone (FSH)
\nGrowth hormone (GH)
\nLeutinising hormone (LH)
\nThyroid stimulating hormone (TSH)
\nAdrenocorticotropin hormone (ACTH)
\nIntermediate lobe \u2013
\nMelanocyte-stimulating hormone (MSH)
\nThyroid
\nCalcitonin
\nTri-iodothyronine(T3)
\nTetraiodothyronine\/Thyroxine(T4)
\nParathyroid
\nParathormone (PTH)
\nAdrenal
\nAdrenal cortex \u2013 Mineralocorticoids, Glucocorticoids
\nAdrenal medulla \u2013 Adrenaline, Noradrenaline
\nPancreas
\nGlucagon, Insulin, Somatostatin
\nTestis
\nTestosterone, Androsterone
\nOvary
\nRelaxin, Oestrogen, Progesterone,
\nThymus
\nThymosin
\nAtrium
\nAtrial natriuretic factor (ANF)
\nKidney
\nErythropoietin
\nG-I Tract
\nStomach \u2013 Gastrin
\nIntestine \u2013 Secretin, Enterogastrone, Cholecystokinin, Enterocrinin, Duocrinin
\nLiver \u2013 Angiotensinogen<\/h3>\n

4. Fill in the blanks:
\nHormones Target gland
\n(a) Hypothalamic hormones __________________
\n(b) Thyrotrophin (TSH) __________________
\n(c) Corticotrophin (ACTH) __________________
\n(d) Gonadotrophins (LH, FSH) __________________
\n(e) Melanotrophin (MSH) __________________<\/h2>\n

Solution:
\n(a) Hypothalamic hormones \u2013 Pituitary gland
\n(b) Thyrotrophin (TSH) \u2013 Thyroid gland
\n(c) Corticotrophin (ACTH) \u2013 adrenal cortex
\n(d) Gonadotrophins (LH, FSH) \u2013 Testis and ovaries
\n(e) Melanotrophin (MSH) \u2013 Pigment cells of the dermis of the skin<\/h3>\n

5. Write short notes on the functions of the following hormones:
\n(a) Parathyroid hormone (PTH)
\n(b) Thyroid hormones
\n(c) Thymosins
\n(d) Androgens
\n(e) Estrogens
\n(f) Insulin and Glucagon<\/h2>\n

Solution:
\n(a) Parathyroid hormone (PTH)
\n1. It is a peptide hormone which is secreted by the parathyroid gland
\n2. The circulating levels of calcium ions regulates its secretion
\n3. The levels of calcium ions in the blood is increased by PTH.
\n4. The bone resorption process is triggered by PTH.
\n5. The reabsorption of calcium ions by the renal tubules is triggered which increases calcium ions absorption from the food that is digested
\n6. PTH is a hypercalcemic hormone which increases the blood Ca2+ levels
\n7. It has a critical role to play in balancing calcium in the body along with TCT, i.e., in calcium homeostasis.
\n(b) Thyroid hormones Thyroxine\/tetraiodothyronine(T4)
\n1. This hormone checks the basal metabolic rate (BMR) and body growth such as mental development and ossification of bones
\n2. The body weight is controlled.
\n3. It controls the tissue differentiation and metamorphosis of tadpole larva into an adult frog
\n4. Formation of RBC is suppressed
\n5. Tri-iodothyronine(T3) \u2013 The energy consumption and body\u2019s oxygen are increased. It also increases heart rate and force of contraction which inturn increases the cardiac output
\n(c) Thymosin
\n1. The differentiation of T-lymphocytes is triggered which provides cell-mediated immunity
\n2. The antibody production is facilitated to provide humoral immunity
\n3. The rate of division of cell in children is triggered thereby promotes growth
\n(d) Androgens
\n1. The interstitial cells located in the intertubular space generate a collection of hormones called as androgens, testosterone mainly
\n2. Checks the maturation, development and functions of the male accessory sex organs such as epididymis, vas deferens, urethra, seminal vesicles, prostate gland etc.
\n3. These trigger the growth of facial and axillary hair, muscles, aggressiveness, low pitch of voice etc.
\n4. In the phenomena of spermatogenesis, these play a critical stimulatory role
\n5. They act on the central neural system which influences the male sexual behavior
\n6. They generate anabolic effects on carbohydrate metabolism and protein
\n(e) Estrogen
\n1. It triggers the development of ovarian follicles and the growth & development of the female reproductive organs namely the fallopian tube, uterus and vagina
\n2. It causes the LH secretion to increase and FSH secretion to decrease
\n3. The sensitivity of the uterus to the hormone \u2013 oxytocin is enhanced
\n4. The development of mammary gland is facilitated
\n5. The female sexual behavior is regulated.
\n(f) Insulin
\n1. Glucose homeostasis is regulated
\n2. It acts on hepatocytes and adipocytes
\n3. The transport of glucose to the muscles from blood is triggered
\n4. The oxidation of glucose is facilitated and brings about glycogenesis, i.e., the conversion of glucose to glycogen causing hyperglycemia
\nGlucagon
\n1. It is critical in maintaining normal blood glucose levels
\n2. Acts on hepatocytes which triggers the conversion of glycogen to glucose
\n3. The gluconeogenesis phenomena is triggered i.e., the conversion of non-carbohydrate particles namely \u2013 proteins and fats to glucose<\/h3>\n

6. Give example(s) of:
\n(a) Hyperglycemic hormone and hypoglycemic hormone
\n(b) Hypercalcemic hormone
\n(c) Gonadotrophic hormones
\n(d) Progestational hormone
\n(e) Blood pressure lowering hormone
\n(f) Androgens and estrogens<\/h2>\n

Solution:
\n(a) Hyperglycemic hormone and hypoglycemic hormone \u2013 Glucagon and Insulin respectively
\n(b) Hypercalcemic hormone \u2013 Parathormone hormone (PTH)
\n(c) Gonadotrophic hormones \u2013 Follicle-stimulating hormone (FSH) and Luteinizing Hormone (LH)
\n(d) Progestational hormone \u2013 Progesterone
\n(e) Blood pressure lowering hormone \u2013 Atrial natriuretic factor (ANF)
\n(f) Androgens and estrogens \u2013 Androgen \u2013 Testosterone and androsterone
\nEstrogen \u2013 \u03b2- oestradiol<\/h3>\n

7. Which hormonal deficiency is responsible for the following?
\n(a) Diabetes mellitus
\n(b) Goitre
\n(c) Cretinism<\/h2>\n

Solution:
\nThe hormonal deficiency that is responsible for the following are:
\n(a) Diabetes mellitus \u2013 Insulin (inadequate secretion) which is caused due to abnormally high glucose levels in the blood
\n(b) Goitre \u2013 Thyroxin (inadequate secretion)
\n(c) Cretinism \u2013 Thyroid (inadequate secretion)<\/h3>\n

8. Briefly mention the mechanism of action of FSH.<\/h2>\n

Solution:
\nFollicle stimulating hormone or FSH is a glycoprotein polypeptide hormone which is not soluble in lipid and therefore cannot enter the target cell. It binds to the surface of the cell which activates the cellular systems to carry out its functionalities.
\nMechanism of FSH
\n1. FSH molecule binds to the receptor protein which is located on the surface of the cell forming the hormone-receptor complex
\n2. The formation of hormone causes the receptor complex to activate the adenyl cyclase enzyme
\n3. This enzyme converts ATP to cyclic AMP as a second messenger which inturn activates the follicular cells of membrane of granulose to produce estrogens.<\/h3>\n

9. Match the following:
\nColumn I
\nColumn II
\n(a) T4
\n(i) Hypothalamus
\n(b) PTH
\n(ii) Thyroid
\n(c) GnRH
\n(iii) Pituitary
\n(d) LH
\n(iv) Parathyroid<\/h2>\n

Solution:
\nColumn I
\nColumn II
\n(a) T4
\n(ii) Thyroid
\n(b) PTH
\n(iv) Parathyroid
\n(c) GnRH
\n(i) Hypothalamus
\n(d) LH
\n(iii) Pituitary<\/h3>\n","protected":false},"excerpt":{"rendered":"

Class 11 Biology NCERT book solutions for Chapter 22 – Chemical Coordination and integration Questions and Answers.<\/p>\n","protected":false},"author":21830,"featured_media":120091,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":{"0":"post-120339","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-education"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts\/120339","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/users\/21830"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/comments?post=120339"}],"version-history":[{"count":1,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts\/120339\/revisions"}],"predecessor-version":[{"id":120343,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts\/120339\/revisions\/120343"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/media\/120091"}],"wp:attachment":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/media?parent=120339"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/categories?post=120339"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/tags?post=120339"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}