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.

(a) The system A is an endocrine system. System A (endocrine system) consists of glands.

(b) The chemical substance C is hormones.

(c) The tissue D is endocrine glands. Hypothalamus, thyroid, ovaries, pancreas and adrenal glands are five such tissues in the human body.

(d) The system B is the nervous system. The system B (nervous system) consists of the brain, spinal cord and nerves.

(e) The fibre E is the nerve fibres.

(f) The system B (nervous system) controls the functioning of the system A (endocrine system).

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Updated on: 24-Mar-2023

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