Q4 of 39 Page 143

Given below are two diagrams (one is correct, the other is somewhat incorrect) showing the transport of a hormone from its source gland/cell to the target organ/cell.


(a) Which one has the error – A or B?.......


(b) What is the error?........................

(a) There is an error in diagram A.


(b) In figure, A hormones secreted by endocrine gland is moving in a single direction towards the target cell. But in figure B hormones secreted by endocrine gland is carried to all parts as they may have one or more target sites at a time which is correct. Hormones are carried to all parts as shown in figure B by arrows and they produce an effect in one or more target sites.


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2

Mention three important differences between the action of hormones and that of nerves in the regulatory mechanism of our body.

 1

Study the diagram given below and then answer the questions that follow:





(a) Name the cells of the pancreas that produce (1) glucagon (2) insulin.


(b) State the main function of (1) glucagon and (2) insulin.


(c) Why is the pancreas referred to as an exo-endocrine gland?


(d) Why is insulin not given orally but is injected into the body?


(e) What is the technical term for the cells of the pancreas that produce endocrine hormones?


(f) Where in the body is the pancreas located?


 2

Given alongside is a portion of the human body showing some important structure in ventral (front) view.


(a) Where is this portion located in the body?


(b) Name the structures numbered 1 – 3.


(c) State one main function of each of the structures named above.


(d) Is there any duct to carry the secretion from the structure numbered 2? If so, give its name.

 3

Given alongside is an outline diagram of a human body showing the position of certain organs.


(a) Name the parts numbered 1 to 4.


(b) What is common to all these parts in regard to the nature of their function?


(c) Name the nutrient element which is essential for the normal working of part 2.