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प्रश्न
A and B are two pairs of glands that are present in the human endocrine system. The pair A is found only in females, whereas B is present only in males. Glands A make and secrete two hormones C and D, whereas glands B make and secrete only one hormone E. In addition to hormones, Glands A make gametes F, whereas glands B make gametes G.
(a) What are the glands A?
(b) What are the hormones C and D?
(c) What are the glands B? Name the hormone E.
(d) What are the gametes F and G?
(e) Which event in the life of males and females is associated with the secretion of the hormones C, D and E?
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उत्तर
- The glands A are the ovaries.
- The hormones C and D, secreted by the ovaries, are oestrogen and progesterone, respectively.
- The glands B are the testes. The hormone E, released by the testes, is testosterone.
- (i) The gametes F are ova or eggs. They are produced by the ovaries.
- The secretion of hormones C (oestrogen) and D (progesterone) in females and hormone E (testosterone) in males are associated with puberty.
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One of the following acts as an endocrine gland as well as an exocrine gland. This one is :
(a) salivary gland
(b) pancreas
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(c) dysentery
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A and B are the two systems of control and coordination in the human body. The messages in system A are transmitted in the form of chemical substances C which travel comparatively slowly through the blood stream. The substances C are made in tissues D present in the head and trunk of human body. The messages in system b are transmitted very quickly in the form of electrical impulses through fibres E. The effect of messages transmitted by system b usually lasts for a much shorter time as compared to those transmitted by system A.
(a) Name the system A. What does system A consist of?
(b) Name the chemical substance C.
(c) What is tissue D? Name any five such tissues in the human body.
(d) Name the system B. What does system B consist of?
(e) Name the fibres E.
(f) State whether system A controls the working of system B or system B controls the working of system A.
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