Download Nerves and Digestion

Nerves and Digestion
Chapter 6, Lesson 3
Do Now….
•
1.
2.
3.
4.
In your own words (without the book),
answer the following questions….
What is the nervous system?
What are the cells called that make up
the nervous system?
What are the parts of the central nervous
system?
What makes up the peripheral nervous
system?
The Nervous System
The Nervous System – the control and
communication system of the body.
The command center of the nervous system
is the brain.
Brain – the organ that controls your senses,
thoughts, and actions.
The brain is made up of thousands of
neurons.
Neurons – cells that carry electrical
messages.
The 3 Types Of Neurons
1. Sensory neurons – take information from
the outside world in so that we can
understand what is going on around us.
2. Motor neurons – neurons that take
information from our brain to our
muscles, glands, and organs.
3. Connecting neurons – transmit
messages between the sensory neurons
and motor neurons.
Do Now
• Make a list of things that you can do to
protect your nervous system.
The 2 Main Parts of the Nervous
System
The 2 Parts of the Nervous System are the
central nervous system and the
peripheral nervous system.
1. The Central Nervous System is made up
of the brain and spinal cord.
2. The Peripheral Nervous System is made
up of the nerves that branch out from the
spinal cord to our peripheral body parts.
2 types of movement controlled by
our nervous system.
1. Voluntary – movements that we think
about.
2. Involuntary – movements that we do not
have to think about.
Do Now
• Draw and label the picture on page #162
in your notes.
Figure 6.8
* The central nervous system contains the
brain and spinal cord. They work together
to send messages to the peripheral
nervous system.
Parts of the Nervous System
1. Brain – Control Center (sends out messages) Part of
the Central Nervous System.
2. Peripheral Nerves – The nerve pathways other than the
brain and spinal cord.
3. Spinal Cord – connected to the brain. Part of the
Central Nervous System.
4. Cerebrum – controls vision, touch, and other senses.
5. Cerebellum – helps control balance and coordination.
6. Brain Stem – Controls digestion, breathing, heartbeat.
Links the brain and spinal cord.
Do Now….
Take out your notes and number 1-8.
Now, next to each number, write down the
part of the digestive system that food goes
through as it makes it way through the
digestive system IN ORDER!!!!
The Digestive System
Digestive System – Breaks down the food
you eat into a form that your body cells
can use as fuel
Parts of the Digestive System
1. Salivary glands – glands that produce
saliva, a digestive juice containing
enzymes
2. Esophagus – Muscular tube leading to
the stomach (food tube).
3. Liver – gland that helps digest fat,
maintain blood sugar levels, filter poisons
4. Stomach – produces digestive juice and
acid
5. Gallbladder –organ that stores bile
6. Pancreas – Gland that produces
digestive enzymes
7. Small intestine – Coiled tube connected
to stomach where much of digestion
takes place.
8. Colon – Tube that collects solid waste;
also called the large intestine.
Do Now:
Now that you have seen the video and taken
notes on the parts of the digestive
system…..
It is time to write the essay on the digestion
of a cheerio.
Please, describe the journey of a cheerio as
it enters and leaves the body.
Digestive System:
Starts with….
1. Chewing and mixing the chewed food with
enzymes in saliva. THEN….
2. We swallow food into the muscular tube called
the esophagus. THEN….
3. Food makes it to the stomach where it mixes
with stronger acid in the churning stomach.
THEN….
4. Food particles make it to the small intestine
(THIS IS WHERE NUTRIENTS ARE
ABSORBED INTO THE BLOOD)!
Excretory System:
• Whatever doesn’t get absorbed by your
small intestine becomes waste.
• Excretory System – gets rid of some of the
wastes your body produces and maintains
fluid balance.
The Colon
• Food that can’t be used by the digestive
system goes to the colon.
• When the colon is full, our nerves begin to
sense it, and it tells us we need to go to
the bathroom.
The Kidneys and Bladder
• Kidneys filter the blood, removing water,
and waste substances and maintaining the
body’s fluid balance.
• The bladder is where liquid waste material,
or urine, from the kidneys is stored. When
the bladder is full, nerves send a signal to
the brain that it is time to go to the
bathroom.