1. Aim: What is the main goal of the circulatory system and how does it help the body maintain homeostasis?
Do Now:
Describe some physiological changes (changes in your body) after you ran for a minute ?

2. What does the circulatory system do?
O2 & Glucose
Delivery
It has 2 functions:
It delivers nutrients and oxygen to body cells.
It carries carbon dioxide and other waste products away from the body cells
CO2 & Waste
Removal

3. Why is transport so important?
Body cells (any cell in the body) need oxygen and glucose for respiration.
If these molecules do not reach the cells, the cells will die.
Once the cells perform respiration, waste is produced (carbon dioxide and cellular waste).
If the waste products aren’t removed, the toxic level within the cell would rise, killing the cell.

4. How does the circulatory system provide homeostasis?
As the blood brings nutrients to the cells, it picks up cellular waste and brings it away from the cell,
O2 &
Glucose
CO2 &
Waste

5. How does the circulatory system provide homeostasis? (Cont)
During exercise, your body is using more oxygen and glucose. As a result, blood is pumped faster to your cells so that it can replenish the glucose and oxygen that was used.

6. What organs makes up the Circulatory System?
The Circulatory System is broken into three main parts:
1. The Heart
a) made mostly of cardiac muscle
b) has 4 chambers
2. The Blood:
a) consists of plasma and blood cells
b) types of blood cells: white, red, platelets
3. The Blood Vessels
a) arteries
b) veins
c) capillaries

7. The Heart The heart has 2 main functions
1) The heart pumps oxygenated blood (blood with oxygen) to the cells of the body.
2) The heart pumps deoxygenated blood (blood without oxygen) to the lungs.

8. The Heart (cont) The Heart is separated into 2 sides:
The right side – takes deoxygenated blood from the body and pumps it to the lungs.
The left side – take oxygenated blood from the lungs and pumps it to the body.
There is no mixing of blood

9. The Blood The blood is the liquid part of the circulatory system.
It is classified as a tissue.
The blood has several functions:
- It brings oxygen and nutrients to the cells.
- It removes waste products from the cell.
- It aids in repairing the body.
- It helps in fighting off diseases.

10. The Blood (cont)
WHITE BLOOD CELL
RED BLOOD CELL
PLASMA
PLATELETS

11. The Blood (cont)
The Red Blood Cells contain a protein called hemoglobin that carries oxygen to the cells.
White Blood Cell search for and kill infecting organisms.
Platelets help to form clots and scabs to stop bleeding during a cut.
Plasma is the liquid part of the blood and it contains all the nutrient and cell waste.

12. How many liters of blood do you think you body has in it?

13. The Blood Vessels
The blood moves through the body in a series of tubes.
Arteries are large thick tubes that brings oxygenated blood away from the heart.
Veins are medium sized tube that also have valves that move deoxygenated blood to the heart.
Capillaries are tiny thin walled tubes where molecules are diffuse in and out of the neighboring cells.

14. You Gotta’ Keep ‘em Separated!
Question: Why do you think it is necessary for the heart to have a septum (divider) that separates the right side from the left?
Hint: Think about what type of blood enters the heart compared to what type of blood leaves the heart.
ANSWER: The right side of the heart is receiving DEoxygenated blood from the body. If there is were no valve separating the right chamber of the heart from the left, the heart would pump some of the deoxygenated blood out into the body That would be bad!