Transcript nervous system

Homeostasis: Regulation
How does the nervous system
help us maintain homeostasis?
The game Simon
says works because
_______________
_______________
Using your prior
knowledge
EXPLAIN in
multiple sentences HINT ->
how the game
“Simon Says”
works?
How does the
nervous system
maintain
homeostasis?
The stable internal
balance of an
organism that
ensures survival
The process in which
an organism
controls and
coordinates all its
activities
•Responsible for
regulation
•Control and
coordinates by
sending messages.
•Consists of :
Brain
Spinal Cord
Nerves
Homeostasis: Regulation
How does your brain work?
This cartoon is
implying that
_____________
_____________
_____________
_____________
_____________
___________
These circles are not moving, your brain is
making them appear to move. Try focusing
on one circle. It will stop moving.
•The control center
•Protected by the skull
•Made up of approx.
1 trillion neurons
•Divided into two
hemispheres
Right
Left
•Each hemisphere
controls the opposite
part of the body.
Ex. The Left hemisphere controls
that right side of the body
Look at the chart and say the color,
NOT the word
Your right brain tried to say the color,
but your left brain was reading the word.
A look inside!!!!
The brain
consists of
three major
parts:
1. Cerebrum
2. Cerebellum
3. Medulla
oblongata
•The largest part of
the brain
•Located on both the
right and left
hemisphere
•The center for
thought, memory,
learning, senses and
voluntary
movements.
activity
Read this sign
•Located below and
behind the
cerebrum
•Coordinates all
motor activities
•Maintains the
body’s balance
Located at the base
of the brain and
spinal cord
Controls
involuntary actions
Such activities
include
Heart rate
______________
Breathing rate
______________
Peristalsis
______________
If a human system fails to function
properly, what is the most likely
result?
1. a stable rate of metabolism
2. a disturbance in homeostasis
3. a change in the method of cellular
respiration
4. a change in the function of DNA
Two types of human cells are shown in
the diagram below.
Cell A causes the cells at B to contract. This activity
would be most useful for
1. lifting a book from a bookshelf
2. coordinating the functions of organelles
3. digesting food in the small intestine
4. carrying out the process of protein synthesis
CEREBRUM
CEREBELLUM
MEDULLA
Two types of human cells are shown in the
diagram below.
Cell A causes the cells at B to contract. This activity
would be most useful for
1. lifting a book from a bookshelf
2. coordinating the functions of organelles
3. digesting food in the small intestine
4. carrying out the process of protein synthesis
If a human system fails to function
properly, what is the most likely result?
1. a stable rate of metabolism
2. a disturbance in homeostasis
3. a change in the method of cellular
respiration
4. a change in the function of DNA
Does this image appear to be moving?
• It’s NOT!
• Just kidding, this one
is actually moving
Final Summary
Homework: Nervous system Handout
Imagine you’ve stepped off a curb and a
car doing 70 mph, comes out of
nowhere. Identify 2 human body
systems at work to help you respond
to this stimuli. How do they work
together to help you maintain
homeostasis???
•A cluster of nerves
that run along the
back
•Protected by the
Vertebrae
(backbone)
______________
A group of nerve cells
(neurons) that carries
the messages known
as impulses.
Structural unit of
the brain and
nervous system
which conduct
information and
carry messages
throughout an
organism.
How do we relay the
messages throughout our
bodies to produce an
action?
Topic: Nervous System
AIM: How do nerve impulses reach an
adjacent nerve cell?
DO NOW:
Identify the 3 sections
of the brain describe
their function
Specialized structures
that are sensitive to
stimuli
Ex. Eyes, ears, skin, nose
physical or chemical
changes within or
outside an organism
that cause a response
Specialized structure that responds to
commands of the nervous system
Ex. Muscles,
Glands,
Organs
• One microscopic
nerve cell
• Basic unit of the
nervous system
•There are 100 billion
neurons in the brain
3 Types of
Neurons
• Found in receptors
(sense organs)
• Receive stimulus
1. Sensory Neurons: • Send impulses from
receptors to the
spinal
cord and brain.
2. Inter-Neurons:
• Found in the spinal
cord & brain.
• Receive impulses from
sensory neurons
• Interpret “process”
stimulus
• Send response
command to the
motor neurons
3. Motor Neurons:
• Receives the
impulses from the
inter-neuron,
• Sends response
impulse to the
effectors.
Involuntary sequence of events
starting from the stimulus
until there is a response.
tester
SYNAPSE
Gap/space
between the
axon terminals
of one neuron
and the
dendrites of
the next
Neurotransmitters
Chemical
messengers that
send the impulse
across the
synapse
Examples:
1. acetylcholine
2. Dopamine