NERVOUS SYSTEM

NERVOUS SYSTEM
Life is maintained by coordination of the functions of various
body systems. Coordination is controlled by two main systems:
1- Endocrine system (chemical regulation): is a collection of blood
carrying chemical messengers (hormones) with slow and long standing
action.


2-Nervous system (neural regulation): includes trillions of
interconnected neurons with rapid and short standing action.
FUNCTIONS OF NERVOUS SYSTEM:
Nervous system acts to regulate and coordinate various body
activities necessary to life by allowing us to receive stimuli (sensory
information) from various sensory receptors and then processing them
into appropriate responses made by body organs (effectors).

NERVOUS TISSUE
Nervous tissue is composed of two types of cells: (1) neurons or nerve
cells (figure 1). (2) neuroglia (also called glia or glial cells "means glue").