Transcript Nervous System

Key Questions:
What are the functions of the
nervous system?
What are the 3 types of neurons
and how do they interact?
Key Terms:
Stimulus
Neuron
Dendrite
Nerve
Interneuron
Synapse
Response
Nerve Impulse
Axon
Sensory Neuron
Motor Neuron
Receiving Information

Awareness of what is
around you.

Senses and sensory
cells help map out
surroundings.
Responding to Information

A response is
created for what
you sense.

Duck!!!!
Dendrites- Are where a cell receives
a chemical signal. The “receptor”
of chemical signals.
Nucleus- The Brain of the cell.
Cell Body- The body of the cell.
Axon- An arm like figure that sends
an electric signal to the synapse.
Synapse- Where chemicals are
released from the neuron into
intercellular space.
Nerve Impulse- The Neuron signal.
Nerve- Is a bundle of axons and
dendrites.
Interneuron
Sensory Neuron

Pick up stimuli from the
internal or external
environment and converts it
into a nerve impulse.

Is a neuron that carries nerve
impulses from one neuron to
another.
Motor Neuron

Sends an impulse to a muscle,
and the muscle contracts in
response.
Key Questions:
What is the function of the central
nervous system?
What functions does the
peripheral nervous system
perform?
What is a reflex?
Key Terms:
Central nervous system
Brain
Spinal Cord
Cerebrum
Brainstem
Somatic Nervous System
Autonomic Nervous system
Reflex
Concussion

The “control center” of
the body.

Contains the brain
and spinal cord.

The peripheral nervous
system consists of the
nerves located outside
of the central nervous
system. Two-way traffic

The Brain, located in
the skull and controls
most functions of the
body’s functions.

The spinal cord, is the
thick column of nerve
tissue that links the
brain to most of the
nerves in the
peripheral nervous
system.

Consists of the brain and
spinal cord.

The brain and spinal
cord are surrounded by
a fluid called cerebral
spinal fluid (CSF).

No blood comes directly
into contact with the
brain or the spinal cord.
The PNS extends
from the CNS to
various parts of the
body.
 The PNS sends
messages to the
CNS (sensory) as well
as receives
messages from the
CNS(motor).



Somatic Nervous
System- This system
controls your
voluntary
movements (tying
shoelaces, throwing
a ball).
Autonomic Nervous
System- This system
controls automatic
functions like
breathing.

Reflexes- an
automatic response
that occurs very
rapidly and without
conscious control
(blinking, knee-jerk).
Website:
Brain Interactive
Key Questions:
What overall function do the sense
perform?
How do your eyes enable you to
see?
How do you hear?
Key Terms:
Cornea
Pupil
Iris
Lens
Retina
Nearsightedness
Farsightedness
Eardrum
Cochlea
Semicircular Canal

Vision is controlled
by the eye and eye
muscles.

The eye responds to
light, dilating in dark
rooms and
contracting in well lit
rooms.
Key Terms:
Lens- Focuses light onto the
retina.
Iris- Circular structure that
surrounds the pupil and
regulates the amount of
light entering the eye.
Cornea- Clear tissue that
covers the front of the eye.
Pupil- The opening through
which light enters the eye.
Aqueous Humor- Liquid in
the front of the eye.
Vitreous Humor- Liquid in
the body of the eye.
Key Terms:
Conjunctiva- Mucous
membrane covering the
eyeball.
Sclera- Fibrous outer layer of
the eyeball.
Retina- The layer of
receptor cells that line the
back of the eye. (Rods 120
million black and white.
Cones 6 – 7 million color)
Macula (Fovea centralis)Where the light focuses on.
Optic Nerve- Relays
messages from the eye to
the brain.
Check your blind spot. Does your vision vary from
others?
Click Here
Reflections:
1. Circle and Plus Sign
2. Bar Code and Plus Sign
3. Moving Red Dot and Plus Sign
4. Peripheral Marker Test

Sounds starts as a
vibration (guitar
string, vocal cord,
etc.).

The vibration creates
waves (sound
waves).

The ear receives
sound vibrations.
Key Terms:
Ear Canal- Funnels sound into
the ear.
Eardrum- Vibrates in response
to sound. Separates
middle and outer ear.
Hammer (Malleus)Vibrations pass from the
eardrum to this bone.
Anvil (Incus)- Vibrations pass
from the hammer to this
bone.
Stirrup (Stapes)Vibrations pass from the anvil
to this bone.
Key Terms:
Semicircular CanalsContains receptors to
help with balance.
Cochlea- Bony, snail
shaped tube that is
lines with receptor to
respond to sound.
Auditory NerveConducts impulses to
the brainstem.
Odors get trapped
in the nasal
mucous.
 Receptor cells have
cilia (hair-like
structures) that
send signals to the
brain.
 The brain then
deciphers what the
scent is.

Taste buds along
with the salivary
glands help with
taste, however
they do not work
alone.
 The olfactory
system helps with
the sense of taste.

The skin has many types
of receptors, light
pressure and heavy
pressure, temperature,
and pain receptors.
 All of these receptors use
the peripheral nervous
system to relay the
information to the central
nervous system.
