digestive system

1. REVIEW
Welcome to our
Science Class!

2. REVIEW
Activity: “SIGNAL SORT &
SWITCH!”

3. QUESTION
1. Why did you place this card under
the nervous/endocrine system?
2. Which system acts faster? Which
lasts longer?

4. MOTIVATION
DO IT NOW!
WITHIN 3 MINUTES

5. GUIDE QUESTION
1. What did you notice first when the cookie entered your
mouth?
2. Why is chewing important before swallowing food?
3. Which digestive process is happening in the mouth?
4. How did your saliva affect the cookie?
5. How do you think eating slowly helps your digestive
system?

6. THE HUMAN
DIGESTIVE
SYSTEM
THE BODY SYSTEMS

7. LESSON OBJECTIVES
1. Demonstrate
an
understanding
of the parts and
functions of the
digestive
system
2. Trace the
pathway of food
through the
digestive tract
3. Explain
ingestion,
digestion,
absorption,
assimilation,
and excretion
4. Suggest ways
to maintain a
healthy
digestive
system

8. LET’S DISCUSS
The digestive system is responsible for
receiving food, breaking it down into
nutrients (a process called digestion),
absorbing the nutrients into the
bloodstream, and eliminating the
indigestible parts of food from the body.
DIGESTIVE
SYSTEM

9. DIGESTIVE ORGANS
The mouth is the first organ in the digestive
system. It serves several essential functions:
• Ingestion: Food enters the mouth,
allowing the initial stage of digestion.
• Mechanical Digestion (Chewing): Teeth
break down large food pieces into smaller
ones.
• Chemical Digestion: Saliva initiates
digestion by breaking down starch into
sugar.
MOUTH

10. DIGESTIVE ORGANS
The esophagus ensures the smooth movement
of food from the mouth to the stomach,
allowing for efficient digestion and nutrient
absorption.
Unlike the stomach and small intestine, the
esophagus does not secrete digestive enzymes.
Its primary function is to facilitate the passage
of food.
ESOPHAGUS

11. DIGESTIVE ORGANS
The stomach is a hollow muscular organ that
holds food while it is being mixed with stomach
enzymes.
Its key functions include temporary food
storage, mechanical digestion (through
muscular contractions), chemical digestion (via
acids and enzymes), and controlled emptying of
partially digested food into the small intestine.
STOMACH

12. DIGESTIVE ORGANS
The pancreas is located behind the stomach; it
performs two key functions: it produces enzymes
that break down sugars, fats, proteins, and starches
during digestion.
The pancreas releases hormones into the
bloodstream. These chemical messengers help
regulate blood sugar levels, stimulate stomach
acids, and control appetite and stomach emptying.
PANCREAS

13. DIGESTIVE ORGANS
The liver, the largest organ in the body, performs
essential functions within the digestive system.
The liver continually produces bile, aiding fat
digestion and nutrient absorption. It processes
toxins and removes them from the blood. The liver
creates substances necessary for blood clotting
after injury. It helps maintain healthy blood sugar
levels.
LIVER

14. DIGESTIVE ORGANS
The gallbladder is a small, pear-shaped organ
located beneath the liver. Its primary role in the
digestive system is to store and concentrate bile
produced by the liver.
Bile is a sticky, yellow-green digestive fluid
produced by the liver and stored in the gallbladder.
Its primary function is to break down fats into fatty
acids during digestion.
GALLBLADDER

15. DIGESTIVE ORGANS
The small intestine's main functions include
breaking down food, absorbing nutrients, and
moving the intestinal contents along the digestive
tract. Specifically, the small intestine absorbs
carbohydrates, proteins, and fats. It plays a vital
role in digestion, ensuring efficient nutrient
absorption and waste elimination.
SMALL INTESTINE

16. DIGESTIVE ORGANS
The large intestine, also known as the colon, follows
the small intestine and extends to the anal canal,
where food waste exits the body. The large
intestine performs several essential functions, such
as absorbing water and electrolytes, forming stool,
facilitating bacterial fermentation, and protecting
against infections.
LARGE INTESTINE

17. DIGESTIVE ORGANS
The rectum connects the large intestine to the
anus. It acts as a reservoir where stool accumulates
before being ready for elimination. The anus marks
the exit point for food waste. Muscles, nerves, and
mucous membranes work together to facilitate
healthy bowel movements that you can control.
RECTUM AND
ANUS

18. Activity: FOOD JOURNEY
STORY MAP

19. Activity:
Digestive System in a
Bag (Food Breakdown)

20. Activity:
Digestive System in a
Bag (Food Breakdown)

21. 1. What happens during ingestion?
2. How is digestion different from absorption?
3. Why does most absorption occur in the small
intestine?
4. What is assimilation and why is it important
to the body?
5. What happens if excretion does not occur
properly?
DEVELOPING MASTERY

22. Design a 1-Day Meal Plan
that supports digestion
and explain why.
REAL LIFE TASK

23. 1. How do digestive organs work together?
2. Why is tracing the food pathway
important?
3. How can proper care improve digestive
health?
GENERALIZATION

24. Exit Ticket:
Write:
1. One digestive organ
2. Its function
3. Type of digestion involved
GENERALIZATION

25. Exit Ticket:
Write:
1. One digestive organ
2. Its function
3. Type of digestion involved
GENERALIZATION

26. THANK YOU
FOR
LISTENING!
ANATOMY CLASS

27. Use these elements and illustrations in your presentation. Happy
designing! Don't forget to delete this page before presenting.
RESOURCES PAGE

28. Enhance the learning experience by incorporating these handy
shortcut keys while in presentation mode.
SHORTCUT KEYS
B for blur
M for mic
drop
C for confetti
O for
bubbles
D for
drumroll
Q for quiet
U for unveil
0-9
Any
number
from 0-9
for a
timer

29. *Please delete this section before downloading.
Try this background for an online class.