What are the organs of the
nervous system?
The brain, spinal cord, nerves and sense organs, such as the
eyes and ears.
What are the 3 functions of the
nervous system?
1. Receives information about what is happening in both
inside and outside your body.
2. Directs the way in which your body response.
3. Helps maintain homeostasis.
A stimulus is any change or signal in the environment and the
response is what your body does to react to the stimulus.
How is a stimulus and response
What is a voluntary and
involuntary response of the
nervous system?
How does the nervous system
help to maintain homeostasis?
A voluntary response is swatting a fly and involuntary
response is the beating of your heart.
What are neurons and the
messages that they carry?
Cells that carry information through your nervous system
through nerve impulses.
What is the structure of the
A neuron has a large cell body that contains the nucleus,
threadlike extensions called dendrites, and an axon.
It directs the body to respond appropriately to the
information it receives.
What is the difference between Dendrites carry impulses toward the cell body and axons
dendrites and the axon?
carry impulses away from the cell body.
What is a nerve?
A bundle of nerve fibers.
What are the 3 kinds of
neurons and their functions?
Sensory neurons- pick up stimuli and converts into nerve
Interneurons- carry nerve impulses from one neuron to
Motor neurons- send impulses to muscles or glands.
In the form of electrical and chemical signals.
How does a nerve impulse
travel along the neuron?
What is a synapse?
The junction where one neuron can transfer an impulse to
another structure.
How is a nerve impulse carried
along a synapse?
The axon tip release chemicals that carry the impulse across
the gap.