Q99 of 231 Page 117

Which of the following are often called glands of emergency?

Adrenaline hormone, a hormone is released from adrenal gland, is also known as emergency hormone. During emergency situations like anger, danger and stress etc., this hormone prepares our body to function at maximum efficiency.

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The endocrine gland whose malfunctioning causes diabetes disease is:

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The use of iodized salt is recommended to prevent:

 100

P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.

(a) What is P? Name five organs which contain cells (or group of cells) like P.


(b) Name the nerves Q.


(c) What is R? Give two examples of R.


(d) Name nerves S.


(e) How do messages travel through the nerves Q and S?

 101

The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.

(a) What are cells A?


(b) What is the name of (i) branch B, and (ii) branches C?


(c) What is the microscopic gap D known as?


(d) What is the function of cells like A in the human body?


(e) The cells A are of three types. Name the three types.