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.