Transcript Digestive and Excretory

Topic: Digestive System &
Excretory System
Essential Question: What physical and
chemical changes occur when we digest
food?
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Digestive System
Function- to break down food into
molecules that can be used by the body
Digestion- process that occurs in your
body where food is broken down into
molecules
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
What happens to the food?
Mouth- saliva begins to break down your
food while you chew
Esophagus- lined with mucus which
makes food easy to swallow and move
through the digestive system
Peristalsis- involuntary waves of muscle
contractions that move food down the
esophagus
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Stomach
Food remains in the stomach until it has
been turned into liquid
Digestive juice contains the enzyme pepsin
and hydrochloric acid
Pepsin kills bacteria that enters with food
Hydrochloric acid helps the stomach to
function properly.
Mucus coats and protects the stomach from
acids
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
The Excretory System
The function of the excretory system is
the excrete (get rid of) wastes that are
not helpful to the body.
Wastes that are removed include
carbon dioxide, water, salt, urea
and uric acid.
All excreted wastes travel at
some time in the blood.
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Excretory System
Structures of the excretory system
1.
2.
3.
4.
5.
Skin
Lungs
Liver
Large intestine
Urinary System
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Waste removal
Skin- sweat is waste (salt, uric acid)
Lungs- Carbon dioxide is exhaled
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
The Liver (also part of the digestive
system!)
1. to produce substances that break
down fats
2. produce urea (the main substance of
urine)
3. make certain amino acids (the building
blocks of proteins)
4. filter harmful substances from the
blood (such as alcohol)
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
The Large Intestine
• The large intestine removes solid,
undigested food from the body after
it passes through the digestive
system.
• Waste is stored in rectum until it is
excreted from the body as solid
waste.
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
The Urinary
System
The kidneys filter
the blood to form
urine, which is
excess water, salt,
urea and uric acid.
Now take some time…
• Take 2 minutes to go over your notes and
highlight or underline the main ideas that
answer the essential question, you should not
highlight everything:
Time to use the left hand column
• You will now write your own questions using
the question starters provided.
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
Digestive System
Function- to break down food into
molecules that can be used by the body
Digestion- process that occurs in your
body where food is broken down into
molecules
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
What happens to the food?
Mouth- saliva begins to break down your
food while you chew
Esophagus- lined with mucus which
makes food easy to swallow and move
through the digestive system
Peristalsis- involuntary waves of muscle
contractions that move food down the
esophagus
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
Stomach
Food remains in the stomach until it has
been turned into liquid
Digestive juice contains the enzyme pepsin
and hydrochloric acid
Pepsin kills bacteria that enters with food
Hydrochloric acid helps the stomach to
function properly.
Mucus coats and protects the stomach from
acids
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
The Excretory System
The function of the excretory system is
the excrete (get rid of) wastes that are
not helpful to the body.
Wastes that are removed include
carbon dioxide, water, salt, urea
and uric acid.
All excreted wastes travel at
some time in the blood.
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
Excretory System
Structures of the excretory system
1.
2.
3.
4.
5.
Skin
Lungs
Liver
Large intestine
Urinary System
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
Waste removal
Skin- sweat is waste (salt, uric acid)
Lungs- Carbon dioxide is exhaled
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
The Liver (also part of the digestive
system!)
1. to produce substances that break
down fats
2. produce urea (the main substance of
urine)
3. make certain amino acids (the building
blocks of proteins)
4. filter harmful substances from the
blood (such as alcohol)
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
The Large Intestine
• The large intestine removes solid,
undigested food from the body after
it passes through the digestive
system.
• Waste is stored in rectum until it is
excreted from the body as solid
waste.
Topic: Digestive & Excretory System
Essential Question: What physical and chemical changes
occur when we digest food?
Write a
question
using one of
these
question
starters:
What is…?
Define…?
How does…?
The Urinary
System
The kidneys filter
the blood to form
urine, which is
excess water, salt,
urea and uric acid.
Now let’s write a summary
Look at each question you
wrote on your own, and
answer each question in a
complete sentence.