Q1 of 39 Page 138

Mention the three types of cells of the islets of Langerhans, the name of the hormone they secrete.

(i) Alpha cells ………………………………….


(ii) Beta cells …………………………………………………………


(iii) Delta cells ……………………………………………………….

(i) Glucagon


Explanation: Alpha cells secrete glucagon which increases blood sugar level by converting glycogen into glucose.


(ii) Insulin


Explanation: Beta cells secrete insulin which reduces blood sugar level by converting excess glucose into glycogen and store them in liver and muscles.


(iii) Somatostatin


More from this chapter

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1

Fill in the blanks by selecting the appropriate alternative from those given in brackets.

(i) Regulation of activities inside the body is brought about by ……….. and ………………..systems. (nervous/digestive/endocrine)


(ii) Hormones are secreted directly into the ………………………………. (organs/lymph/blood.)


(iii) Chemically, some hormones are ……….., some steroids, some ……………. (proteins/amines/carbohydrates.)


(iv) Both …………………..or deficiency of hormones leads to serious consequences (excess/absence.)


(v) Hormones produced in one species usually show ……………………influence in other species. (similar/different).

 2

Give the characteristics of hormones pertaining to

(i) Site of action ………………………………


(ii) Chemical nature ………………………………………………


(iii) The manner of transportation ……………………………….

 2

Mention the two principal ways in which insulin acts:

(i) _________________


(ii) _________________

 3

Name the following conditions:

(i) Passage of much glucose in urine ………………………


(ii) Overdose of insulin makes the diabetic patient unconscious ………………………………………………