Circulation and Respiration
How is it accomplished in the human body?
Circulation
Circulation is the heart's function
There are four chambers in the heart: the right atrium, the left atrium, the right ventricle and the left ventricle.
How it functions
Blood from the lungs, flows back into the left atrium and into the left ventricle and is then pumped out into the rest of the body except for the lungs.
Blood then returns to the heart where it enters the right atrium
The heart is a double circulation system. The chambers of the left-hand side are completely separated from the chambers on the right hand side by the septum. It is the hardest working organ in the body but is only about the size of a closed fist. On average, even at rest, the heart pumps 5 litres of blood through the body in one minute.
Respiration
Aerobic Respiration
glucose + oxygen = energy + water + carbon dioxide
Anaerobic Respiration
glucose = energy + lactic acid
Ventilation
- lungs
- tubes which go from the lungs to the mouth and the nose
Structures in the lungs are the trachea or 'windpipe' bites into two bronchi, for each lung. Each bronchus divides into smaller tubes called bronchioles and at the end of the bronchiole you have the alveoli, tiny air sacs which increase the surface area of the lung.
Gars Exchange
How does waste carbon dioxide from your blood get into the air?
When you inhale, small air sacs called alvioli which are surrounded by capillaries, (which fill them with blood full of carbon dioxide from the heart).
Diffusion
Diffusion is when oxygen diffuses in your lungs. The process is best described through tea. When a tea bag is placed in water, the water eventually changes color because the tea has diffused into it. It is similar in our lungs as a gas will always fill its container when able eventually. The oxygen will diffuse into your blood.