Q65 of 130 Page 183

What are hormones? Where are hormones made in the human body?

Hormones are chemical substances which coordinated the activities of the living organisms. Hormones are made and secreted by ductless glands called endocrine glands in the body. The hormones are released directly into the bloodstream and carried to the target site through blood circulatory system.


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Who is responsible for the sex of the unborn child: father or mother? Why?

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What will be the sex of the child born:

(a) if X chromosome carrying sperm fuses with an egg cell carrying X chromosome?


(b) if Y chromosome carrying sperm fertilizes an ovum containing X chromosome?

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What are sex hormones? Name two sex hormones.

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Define (i) menarche, and (ii) menopause.