The nervous system uses .............. to transmit messages.

Q. Fill in the blanks with appropriate words.
The nerves carrying impulse messages from the central nervous system to the effectors are called .......... , while those carrying sensory messages to the central nervous system are called ..........

Q. The peripheral nervous system transmits messages to and from the sense organs and is responsible for

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.
(b) Name the chemical substance C.

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.