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.
(b) Name the chemical substance C.

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Solution

C- Hormones are the substances secreted by the endocrine glands in the blood that targets to bring changes in different parts of the body.

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Q. 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.
(e) Name the fibres E.

Q. 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.

What are the limitations of the nervous system in the human body?
I. The electrical impulses reach only those cells that are connected by the nervous tissue and not each and every cell of the body.
II. Cells cannot continuously create and transmit electrical impulses, once an electrical impulse is generated and transmitted, the cell will take some time to reset its mechanism and create a new electrical impulse.

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