9. Which row in the chart below contains a correct

comparison between nervous regulation and chemical

regulation?

Row Nervous Regulation | Chemical Regulation

A 1 Slow response ) Fast response

Long duration Short duration

Involves neuro Involves hormones

transmitters

Common to all Only in multi-

organisms cellular animals

1) A

2) B.

3) C

4) D

C. INVOLVES NEURONES, INVOLVES HORMONES TRANSMITTERS

Explanation:

The nervous and chemical regulation are similar in that they regulate the functions of the body and their response to stimulus. While nervous regulation involves the use of electrical signals through neurones for the passage of signals to the effector or target cells or tissues, chemical regulation uses hormones which are chemicals transported into the plasma and they target cells. Transmission of signals are fast in nervous regulation as in the case of immediately lifting the hands when they touch hot objects while that of chemical regulation are slow in their response. Nervous regulation elicits their functions within a short time while chemical regulation takes a long period for response ti occur. Also responses are temporal in nervous regulation while in chemical regulations are permanent. So the correct row showing the basic difference between the hormonal and nervous regulation is the row with the mode of transmission of signals that is the involvement of neurones in nervous regulation and hormones transmitters in chemical regulation.