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A and B are the two systems of control a...

A and B are the two systems of control and coordination in the human body. The messages in system A are trasmitted 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 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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