The document discusses how the circulatory and respiratory systems work together to provide cells with nutrients and oxygen while removing carbon dioxide waste. The circulatory system transports blood throughout the body in vessels like arteries, veins, and capillaries. As blood flows through the lungs, it picks up oxygen and releases carbon dioxide. This oxygen-rich blood is then pumped by the heart to cells throughout the body via capillaries, where oxygen is delivered and carbon dioxide is picked up before the blood returns to the heart again. In this way, the circulatory and respiratory systems continuously exchange gases and transport nutrients to keep cells alive.

1. Living Systems
Focus Question:
How do the circulatory and respiratory
systems work together?
Lesson 1-1B

2. Circulatory System Review
What are the basic needs of all living cells?
How do the cells in multicellular organisms get the
resources they need to stay alive?
What is the main function of the left side of the
human heart?
What is the main function of the right side of the
human heart?
What is the function of the red blood cells?
What are the main kinds of blood vessels and what
functions do they perform?
Describe what happens when blood flows through
the lungs.
Describe what happens when blood in capillaries
flows past cells.

3. Circulatory and Respiratory
Systems Video
Watch & listen for information that
confirms what you know about the
circulatory system and how it interacts
with the respiratory system.
Think about how the new information
relates to the big idea of the circulatory
system, which provides life support for
cells.

4. Video Questions
What happens to heart rate during
exercise?
Why does that happen?
How does this help cells in the body?
What happens when a blood vessel is
cut?
How does this help cells in the body?
What other kinds of cells are in the
blood and what do they do?

5. Vocabulary
Cell - the basic unit of life
Oxygen - an atmospheric gas
needed by most living cells
Carbon dioxide - a waste gas
produced by living cells

6. Vocabulary
Heart - a muscular organ that contracts
rhythmically, producing a pulse with
each contraction
Blood - a liquid tissue that flows to and
from cells in blood vessels called
arteries, veins, and capillaries
Arteries - carry blood away from the
heart to the body
Veins - carry blood from the body to the
heart

7. Capillaries - connect arteries and veins.
Gases, nutrients, and wastes are
exchanged between capillaries and
cells
Four chambers of the human heart -
right atrium, right ventricle, left
atrium, and left ventricle
Circulatory system - includes tissues
(blood and blood vessels) and organs
(heart) that transport life-support
substances to cells and removes waste

8. Lung - organ in animals where gases,
such as oxygen and carbon dioxide,
pass between the atmosphere and the
blood
Respiratory system - includes tissues
and organs (lungs) that provide gas
exchange between the blood and
atmosphere
Tissue - a group of similar cells working
together to perform a function

9. Content
What do cells need to stay
alive?
Cells need water, food, oxygen,
and waste disposal to stay
alive.

10. Content
How do cells get the things
they need to survive?
Cells get the things they need
to survive by the circulatory
system which delivers water,
sugar, and oxygen to cells and
carries waste carbon dioxide
away from cells.

11. Content
What is the general path taken by
blood through the circulatory system?
The path the blood flows through the
circulatory system is: from the body to
the right atrium of the heart, to the right
ventricle, to the lungs, to the left atrium,
to the left ventricle, into arteries that
flow into capillaries, which are in
contact with cells. Blood returns to the
heart in veins.
Your questions?