1. The Circulatory System
The Heart and Blood Vessels

2. What does the Circulatory System do for us?
It transports materials from one part of the body to another
It’s kind of like a busy highway system!

3. Circulatory System (arteries, veins & capillaries): like a network of roads that you see above
Blood Cells: like the vehicles that travel on the road

4. What do the blood cells transport?
Food to the Cells
Water to the Cells
Oxygen to the Cells
Carbon Dioxide AWAY from the Cells
Other materials

5. The Heart
Organ that, by contracting, pushes the blood through the circulatory system
Beats (or contracts) about times/minute
Consists of 4 Chambers (rooms)
Atria (left and right)
Ventricles (left and right)

7. The Pathway of blood flow through the heart – animation -

8. Questions for Thought:
1. Look at the picture of the heart on page What do you notice about the walls of the right ventricle compared to walls of left ventricle?
The walls of the left ventricle are MUCH thicker.
Why do you think this is true?
The left ventricle must contract with enough force to force the blood throughout the ENTIRE BODY AND BACK AGAIN. That’s a LOT of force needed! The walls of the left ventricle must have more muscular strength to contract hard enough to force the blood from the heart through the whole body. On the other hand, the right ventricle must only get the blood to the lungs and back. Not as much force is needed, so not as much muscular strength needed.

9. Types of Blood Vessels

10. Questions for Thought:
1. After looking at the picture of the blood vessels, what do you notice about the walls of the arteries compared to walls of the veins?
The walls of the arteries are MUCH thicker.
Why do you think this is true?
The walls of the arteries carry the blood AWAY from the heart and so, have all the force of the ventricle contraction behind the blood. The walls of the arteries must be thick to withstand the pressure of that force without breaking.

11. Types of blood vessels Arteries Aorta Arterioles Capillaries Veins
Circulatory System Part
What is it?
What is its function?
Arteries
Large blood vessels
Take blood AWAY from heart
Aorta
Largest artery in body
Carries a large volume of blood
Arterioles
Blood vessels smaller than arteries; larger than capillaries
Carry blood TO the capillaries
Capillaries
Smallest blood vessels of circulatory system
Delivers supplies to cells & takes away waste
Veins
Bring blood back to the heart
Venules
Small veins
Bring blood from capillaries to the veins

12. Valves
In the circulatory system, valves keep the blood flowing in the direction that it is supposed to go:
In the heart
located between the atria and the ventricles
located between right ventricle and pulmonary artery
located between left ventricle and the aorta
In the veins
Located in lower extremity veins to keep blood moving UP toward heart, flowing AGAINST gravity

13. Types of Circulation Systemic
network of vessels that carry blood from the heart to the body and from the body back to the heart.

14. Types of Circulation Cornary
Network of arteries and veins that supply blood to all cells of the heart.
Question: Why can’t the heart cells get oxygen and nutrients from the blood that travels through the heart?

15. Types of Circulation
Pulmonary Circulation – network of vessels that carries blood from heart to the lungs and from the lungs back to the heart.

16. Circulatory Illnesses
1. Hypertension – Know the definition
2. Atherosclerosis – Know the definition?
3. Heart Attack – Know the definition?
4. Heart Failure – Know the definition?
5. Stroke – Know the definition?