Class 11 Biology Important Chapter 19 Chemical Coordination and Integration

Class 11 Biology Important Chapter 19 Chemical Coordination and Integration Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Biology Important Solutions and select need one. AHSEC Class 11 Biology Additional Notes English Medium Download PDF. HS 1st Year Biology Important Solutions in English.

Class 11 Biology Important Chapter 19 Chemical Coordination and Integration

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 11 Biology Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Biology Important Notes in English for All Chapters, You can practice these here.

Chemical Coordination and Integration

Chapter: 19

IMPORTANT QUESTION AND ANSWER

Very Short and Short Answer Type Question:

1. Name the endocrine part of pancreas.

Ans. The endocrine part of pancreas consists of small masses of hormone secreting cells called Islets of Langerhans. It consists of a, b and d cells etc.

2. Name some endocrine glands in human.

Ans. Pituitary, thyroid, pineal, thymus, pancreas, ovary, testis and atrium etc.

3. Name the only hormone secreted by pars intermedia of the pituitary gland.

Ans. Melanocyte stimulating hormone.

4. Why catecholamines are called emergency hormones?

Ans. Adrenaline and noradrenaline are secreted in response to stress and emergency. Hence called emergency hormones

5. Name the two hormones secreted from the follicles of thyroid.

Ans. (i) Thyroxine, (ii) Triodo-thyroxine.

6. Mention one symptom of hypothy-roidism and name the disorder.

Ans. Symptoms of hypothyroidism in children is mental retardation. Disorder: Cretinism/Goitre.

7. What is the function of gluco-corticoids?

Ans. They regulate the metabolism of carbohydrates, fats and proteins.

8. Name some endocrine glands in human.

Ans. Pituitary, thyroid, pineal, thymus, pancreas, ovary, testis and atrium etc.

9. Which hormone is known as ‘milk ejection hormone’?

Ans. Oxytocin.

10. Name the hormones of fight or flight. [V. Imp.]

Ans. Adrenaline and nor-adrenaline hormones.

11. Explain the role of the hypothalamus in the endocrine system.

Ans: The hypothalamus is a key region in the brain that plays a vital role in regulating the endocrine system.

(i) It is located below the thalamus and connects to the pituitary gland.

(ii) The hypothalamus produces releasing hormones (e.g., GnRH, TRH) and inhibiting hormones (e.g., somatostatin) that control the release of hormones from the pituitary gland.

(iii) It regulates body temperature, hunger, thirst, and sleep-wake cycles.

(iv) It also controls the autonomic nervous system and helps in the control of the pituitary gland, making it a critical component in hormone regulation.

12. What is the cause and features of acromegaly?

Ans. Acromegaly is caused by excess of GH in adults and shows large disproportionate body.

13. What is the role of second messenger in hormone action? 

Ans. The hormones that do not enter target cell, interact with specific receptors found on surface of target cell membranes as well as generates second messengers like CAMP on inner side of plasma membrane. This second messenger, then carries out all hormonal functions.

14. Name the gland that secretes vasopressin. What are its principal functions?

Ans. It is secreted by posterior part of the pituitary gland (formerly called hypophysis).

Function: Osmoregulation, water reabsorption of blood vessel, rise in blood pressure.

15. What is the function of Leydig’s cells?

Ans. Leydig cells (interstitial cells) of the testes secrete testosterone hormone that stimulates development of external male sex characters such as beards, moustaches and low pitch voice in man and stimulates the formation of sperms in testis.