Page 61 - Science Course 2 (Book 1)

Mo2-L4b: How Does the Body Move?

Most of the information then is sent to the central
nervous system for processing.

After the central nervous system processes
information, it signals the peripheral nervous
system to respond.

The visual system The olfactory
receives light system receives order
signals. signals

The auditory system There are many different
detects sound. sensory receptors for
The body carries out both voluntary and involuntary touch. Some receive
functions that depend on the nervous system. signals that detect
temperature
Automatic movements in response to a signal are
called reflexes.

3. After you respond to stimuli, nerve
signals travel from the spinal cord Taste buds receive
to the brain, and you feel pain chemical signals.

1. Receptors in your hand detect
stimuli (heat and pain). They
send signals through servers to
your spinal cord.

2. Responding nerve signal are sent
directly from the spinal cord to
muscles in your arm, and you pull
your hand away.

Humans detect their external Each of the five senses has specific
environment with five senses— neurons that receive signals from the
vision, hearing, smell, touch, environment.
and taste.
Information detected by the senses is
sent to the spinal cord and then to the
brain for processing and a response.

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