Science "The Nervous System" lesson outline lesson 1 ( part 2 or 2)

Many drugs

affect the nervous system by speeding up or slowing down the communication between neurons.

The autonomic system

also controls cardiac muscles and smooth muscles.

Physical injuries

are the most common way the nervous system can be damaged.

The spinal cord sends information back and forth between the

brain and the rest of the body.

The area of the brain that controls involuntary functions is the

brain stem.

The body maintains homeostasis

by receiving information from the environment and responding to it.

The part of the brain that coordinates voluntary muscle movement and regulates balance and posture is the

cerebellum.

The nervous system senses changes in the

environment and signals other systems to make adjustments.

The Peripheral Nervous System

has sensory neurons and motor neurons that transmit information between the CNS and the rest of the body.

The spinal cord

is a tubelike structure of neurons.

Paralysis

is loss of muscle function and sometimes loss of feeling. The injured nerves can no longer send and receive signals.

The somatic system

of the PNS controls skeletal muscles.

The autonomic system

of the PNS regulates involuntary actions such as dilating blood vessels and the beating of the heart.

An automatic movement in response to a stimulus is an

reflex.