Rayat Shikshan Sansthas Sadhana Vidyalaya Hadpsar Pune28 STD

Rayat Shikshan Sanstha’s Sadhana Vidyalaya, Hadpsar, Pune-28 STD – 7 TH Subject – G. Science Topic –Control and Co-ordination Sub Topic –The nervous system v. PRESENT BY Sou. Gawande D. M

q. In summer the temperature is high while in winter it is very low. Even then our body temperature is maintained at about 37ºc in any season. These responses of the body-esting more energy –giving food in winter, increased sweating and thirst in summer-help the body to maintain the right temperature.

It means that even as conditions inside and outside the body change all the time, changes in life processes also take place in accordance with them, , sothat, on the whole, life goes on at aprper level. this the optimum level of the body in the given conditions is maintained in all circumstances. This continuous process of adjustment is Called Homeostasis

The nervous system In order to control and coordinate the life processes, man’s nervous system consists of the brain, the spinal cord and the nerves or nerves firbres.

v The central nervous system v The peripheral nervous system

ØThe brain and the spinal cord belong to the central nervous system. They regulate all actions of the body. The nerves form the peripheral nervous system. The nerves connect the various parts of the body to the central nervous system

The nerves are of two types: 1. Afferent nerves 2. Efferent nerves. 1. Afferent nerves : Afferent nerves bring information about the different parts of the body to the central nervous system

2. Efferent nerves : Efferent nerves carry the commands given by the central nervous system to the various parts of the body.

HOME WORK Give the Function of : A] afferent nerves B] Efferent nerves