The circulatory system delivers oxygen and nutrients to cells and removes carbon dioxide and waste. It consists of the heart, blood vessels, and blood. The heart pumps blood through two circuits - pulmonary circulation to the lungs to oxygenate blood, and systemic circulation to the rest of the body. The heart has four chambers that collect and pump blood, with valves to prevent backflow. Oxygenated blood returns from the lungs to the left side of the heart and is pumped through arteries, while deoxygenated blood returns via veins to the right side to be re-oxygenated.

2. EARTH
IESARRET
EINVS
AIAIESRLLPC
HEART
ARTERIES
VEINS
CAPILLARIES

3. OODBL
AEVVL
AATRO
AUIMTR
BLOOD
VALVE
AORTA
ATRIUM

4. Circulatory System

5. The Main Function:
● The Circulatory System delivers food and
oxygen to body cells and carries carbon
dioxide and other waste products away from
body cells.
● How can we tell that our circulatory system is
working properly right now?

6. What you should know about your heart rate?
● Even if you’re not an athlete, knowledge about
your heart rate can help you monitor your
fitness level — and it might even help you spot
developing health problems.

7. ● Your heart rate, or pulse, is the number of
times your heart beats per minute. Normal
heart rate varies from person to person.
Knowing yours can be an important heart-
health gauge.

8. Checking Heart Rate/Pulse

9. ● Your resting heart rate is the heart pumping
the lowest amount of blood you need because
you’re not exercising.

11. Start Human Heart Rate Lab
● Follow Procedures
● If you are in the hallways, DO NOT disturb
other classes.
● External stimulus: use iPads in classroom.

12. Review: Main Function
● Transport materials needed by cells: Oxygen and
Glucose.
● Removes waste materials from cells: Carbon dioxide and
Urea

13. Major Components
● Heart: Acts as the pump. Continuously
circulates the blood.
● Networks of tubes: Arteries move blood AWAY
from the heart. Veins bring blood back to the
heart.

14. ● Blood: Fluid that fills the circulatory system.

15. The Right Side of the Heart
● Right Atrium: Upper chamber. Collecting
chamber for blood returning to heart. Oxygen
poor blood. Carbon dioxide rich
● Right Ventricle: Lower chamber. Pumping
chamber. Forces blood to lungs. Carbon
dioxide is “dropped off” and then is exhaled
out.

16. ● At the same time, red blood cells are “picking
up” oxygen. This blood then travels back to
the heart.

17. Left Side of the Heart
● Left Atrium: The oxygenated blood from the
lungs is then collected here.
● Left Ventricle: Pumps blood to every part of
the body. The left side of the heart works
harder than the right side.

18. Arteries: Pipeline from Heart
● Aorta: The main blood supplier to the body. It
branches off into two main coronary blood
vessels called arteries. These arteries carry
blood away from the heart.

19. Veins: Pipeline to the Heart
● Veins carry the oxygen depleted blood to the
heart.
● The valves in the veins help keep the blood
from flowing backward.

21. Capillaries: The Unseen Pipelines
● Remember, the job of the blood is to deliver and pick up
material from all parts of the body. Arteries walls are to
thick.
● Capillaries carry out the delivering of oxygen and picking
up the waste.
● Capillaries walls are very thin which allows oxygen and
waste to pass through.
● Capillaries connect the arteries to the veins.

23. Pulmonary circulation
is a circuit that
provides blood flow
from the heart to the
lungs; and back to
the heart.

24. Systemic circulation
is a circuit that
allows blood to flow
from the heart to the
rest of the body;
excluding the lungs.

25. Coronary circulation
is a circuit that
strictly provides
blood to the
tissues of the
heart.

28. Guide Questions:
1. How big is the heart? What is its function?
2. How many chambers does a heart have? What
are they?
3. Why are valves important?
4. What is an oxygenated blood? Where does it
come from?
5. What about deoxygenated blood?

30. Superior Vena Cava
Tricuspid
Right Atrium
Left Atrium
Bicuspid
Pulmonary Artery
Lungs
Left Ventricle
Aorta
Right Ventricle

31. Guide Question:
Based on the diagram above, explain
how the lungs and the heart work
together to transport nutrients, gases
and other molecules to and from the
different parts of the body.

32. The human heart as seen in figure 2 above is about the size of your fist. It is
divided into four chambers: two atria and two ventricles. The right atrium
receives deoxygenated blood through the superior vena cava, which drains blood
from the head and from the veins that come from the arms. The deoxygenated
blood carries more carbon dioxide to be expelled from the body. The inferior
vena cava, drains blood from the veins that come from the lower organs and the
legs. This deoxygenated blood then passes through the right atrium then to the
right ventricle through the tricuspid valve, which prevents the backflow of blood.
After it is filled, our right ventricle contracts, pumping the blood to the pulmonary
veins, through the pulmonary valve then to the lungs for oxygenation. The left
atrium receives the oxygen-rich blood from the lungs through the pulmonary
artery. This blood passes through the bicuspid valve to the left ventricle where
the blood is pumped into the aorta through the aortic valve. The aorta is our
largest artery in the body, taking oxygenated blood to the organs and muscles of
the body. The oxygenated blood carries more of oxygen to deliver to our body