1. Circulatory System

2. Its purpose
The purpose of our circulatory system is to transport nutrients and oxygen and wastes throughout the body or out of the body.
The main pump is the heart and several valves (flexible flaps) increase pressure. They open when blood pushes through them and close to prevent backward flow. This is a closed system as it flows through a series of tubes and not openly through the body

3. The heart 4 chambers, 2 atria and 2 ventricles
The blood enters the heart deoxygenated (without oxygen) and is pumped to the lungs to pick up oxygen and get rid of CO2
This pathway goes from the right atria to right ventricle through the pulmonary artery to the lungs

4. The heart
Then it goes back to the heart into the left atrium and left ventricle where it is pumped to the rest of the body through the aorta (a huge artery)
Some blood stays with the heart as it is an organ that needs blood as well.

5. The heart diagram

7. Capillaries
Arteries and veins are larger tubes. Their walls are too think for gas exchange to occur so the tubes get progressively smaller until they are capillaries where the walls are so thin that gas molecules can cross easily into the cell or out of the cells.
The main purpose of capillaries is to bring blood closer to the cells and to assist with the transport of oxygen and waste CO2

9. Heart Disease
Blockages based on buildup of wastes in arteries can cause server stress on your heart. Your heart can develop holes or faulty valves
All these have serious effects on your bodies ability to get oxygenated blood to all its cells

10. Respiratory System
When you breath your muscles contract and your rub cage moves up causing diaphragm goes down causing negative pressure. This sucks air into the lungs.
Mucus coats your passages from your nose to your lungs to prevent foreign bodies and to keep the area moist
Air passes through your nasal passage, pharynx, trachea, then to the bronchi, to bronchioles until eventually it goes to tiny sacs called alveoli.

11. The hemoglobin they contain causes them to pick up oxygen
The hemoglobin they contain causes them to pick up oxygen. Oxygenated blood travels throughout the body based on the interaction between alveoli and the capillaries where fgas exchange occurs.

12. Respiratory System

13. Respiratory system