Organs work together to keep the human body functioning properly. The document discusses several key organs and body systems: 1) Organs such as the heart, lungs, and stomach each have specific jobs to carry out important processes like circulation, gas exchange, and digestion. 2) Bones and muscles also work together, with bones providing structure and muscles enabling movement. Muscles contract in pairs to move the skeleton. 3) The circulatory system transports blood throughout the body using arteries and veins. Blood carries oxygen from the lungs to tissues and removes waste to be filtered by the kidneys. 4) The digestive system breaks down food using organs like the liver, pancreas, and small intestine and

1. Chapter 2
How Do Parts of Living Things Work
Together?

2. Lesson #2
ORGANS & MOVEMENT

3. Organs
Structures that carry
out specific jobs as
you live and grow.
Heart
Lungs
Stomach

4. Organs in the Human Body
• What organ of the human body can you observe in this photo?
• Why can’t you observe any other organs in this photo?
• Why does the body need a wide variety of organs to function
properly?

5. Moving the Human Body
Bones Muscles

6. Moving the Human Body
Bones are a type of organ.
The framework of bones in your body is
called a skeleton.

7. Moving the Human Body
Bones can’t move on their own, you need muscles for
that.
• Why is it
important for
skeletal muscles
to work in pairs?
• Why might it
be important to
have involuntary
muscles in
organs like the

8. Lesson #3
MOVING BLOOD AND OXYGEN

9. Blood
Veins carry blood toward the Arteries carry blood away
heart. from heart.

10. Blood
• How are veins and arteries
alike?
• How are they different?
Circulatory System Animation
• Which parts of the body
receive blood from blood
vessels?
• Why do body parts need
blood?
• What happens to blood after it
leaves the heart? (Let’s find
out!)

11. The Heart
• What happens when the
heart beats?
Let’s Watch!
• Does blood travel inside the
heart through one pathway, a
few pathways, or many
pathways?
Let’s Check!
• When blood leaves the
heart, can it travel through
only one pathway, a few
pathways, or many pathways?
Let’s Check!

12. The
Lungs
Lungs Animation
• What happens to
the air you breathe
into your lungs?
What two gases are
involved?
• Why is this
exchange of gas
important?
• Why is the heart
necessary for the
lungs to work
properly?

13. Lesson #4
GETTING FOOD AND
REMOVING WASTE

14. The
Digestive
System
We all need food,
but in order to use
the chemical,
potential energy in it
we need to digest it
and get rid of the
parts our bodies
can’t use.
To accomplish this
task your body
comes equipped
with a digestive
system.

15. The Digestive System
Pancreas Liver
While the pancreas and liver are part of the digestive system, food does
not pass through them. Instead, both make substances that help break
down food so that it can be digested.

16. Pancreas
The Pancreas
makes juices
that help your
body digest
food.
It also helps
the body use
sugars.

17. Liver
The liver is a
very large and
important
organ.
It makes bile
that enters the
small intestine
and helps
digestion.

18. Organs in
Digestion
• Where does the
Esophagus carry food
to?
• What happens to
food in the stomach?
• Where does it go
from there?
• What happens to
food in the small
intestine?
• What happens to any
remaining food after it
leaves the small

19. Kidneys
What are the
purpose of
kidneys?
Let’s explore!

20. Bladder
Why is the
bladder an
important
organ?

21. Lesson #5
CONTROLLING THE HUMAN
BODY

22. The Brain
• When I pick up a pencil,
where in my body do I decide to
do it?
• How did the message to bend
over and pick it up travel to my
arms and legs?
• What kinds of messages
might begin and end inside the
brain?
• Why is it important for parts
of the brain to keep working
even when you are asleep?
Click here to explore your brain!

23. Review
Click here to review body
systems with an amazing video!

24. Review Questions