Download Nervous System

Mrs Morgan
Biology
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The brain
communicates with the
different parts of the
body to make it move.
The body
communicates with the
brain to keep the body
in homeostasis.
The bodies interactions
with the environment
are communicated to
the brain.
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The hypothalamus is
located in the brain.
The hypothalamus
gland does most of
the work to keep the
body in homeostasis.
The hypothalamus
controls the endocrine
system which
regulates hormones
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These hormones
regulate:
Hunger
Thirst
Emotions
Body Temperature
Fatigue
And many more
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Positive feedback loops
A hormone is released to
speed up a process.
Example: a mother
producing breast milk. As
a mother begins to breast
feed, she produces a
hormone that makes the
milk come out faster.
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Negative feedback loops
A hormone is released
that will slow down a
process
Hormones can regulate
enzyme production
meaning it changes how
fast processes are
happening in your body.
Examples: Blood glucose
regulation
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The main function of
the nervous system is
to send signals to
other parts of the
body
How do we send
these signals to make
the body do what we
want?
 Hormones
 Neural signaling
(The neurons send signals
to the body part it wants
to change)
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The transmission of a
nerve impulse along a
neuron from one end to
the other occurs as a
result of chemical
changes across the
membrane of the
Neuron.
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Sensory neurons are
the nerves which
transmit the external
stimulus from the
external structures to
the brain as chemical
impulses, which are
the senses like touch,
hearing, taste, vision .
. etc.
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Motor neurons pass
their impulses to muscle
cells.
The location at which a
neuron can transfer an
impulse to another cell
is a called a synapse.
Neurotransmitters are
chemicals used by a
neuron to transmit an
impulse
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The brain relays messages to the entire body. It
processes information and helps you analyze
what you see feel and think.
The brain has four major lobes. Each lobe
provides a different function.
Frontal LobeParietal lobeOccipital lobeTemporal lobe-
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Somatic Nervous
system
Regulates activities
that are under
conscious control
If you can think about
it and do it then it is
somatic
Examples include:
running, jumping,
tapping your fingers
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Autonomic Nervous
system
Regulates activities that
are automatic or
involuntary.
These are activities that
you can not control.
Examples include: heart
rate, secretion of
enzymes, digestions of
food, bladder control
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The five main sections of the brain are:
Cerebrum-largest part/conscious activity in the
body/intelligence, learning, judgment
Cerebellum- located at back of the skull/ coordinates
muscles so body can move gracefully
Brain Stem-connects brain and spinal cord/regulates
flow of information between brain and body
Thalamus-receives messages from all of the sensory
receptors in the and relays the messages to the proper
places in the brain
Hypothalamus- control center for recognition of
hunger, thirst body temp etc.