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1. red blood cells transport oxygen to your muscles
2. Arteries have high pressure compared to veins that have low pressure. Arteries carry oxygenated blood and veins carry deoxygenated blood.
3. To prevent the backflow of blood
4. spectrum
5. The double circulatory system pumps blood twice per circuit. On the right hand side deoxygenated blood is sent to the lungs
6. Dancer B will have better blood flow because he is moving around which means that his body needs more oxygen. Dancer A will have worse blood flow, because he is standing still and not moving as much. This means that his muscles require less oxygen, which means less blood.
7. carrying oxygen to the body and removing carbon dioxide from the body
8.volume of blood you pump per contraction
9. cardiac output is the volume of blood leaving the heart per unit time
10.5.950L,8250L,13950L
11.Arteries have
12. a) Temporal & Radial
13. Hemoglobin is the protein that carries oxygen to the bodies muscles and organs. It is always attached to red blood cells.

# data[].attributes.body
1. They are responsible for transporting oxygen.
2. Arteries carry blood away from the heart and veins to the heart. Also, veins have valves but arteries don't.
3. It prevents the back flow of blood.
4. Septum
5. Blood enters the right atrium from the body through the vena cava. Then it goes to the right ventricle and then to the lungs through the pulmonary artery. Then it goes to the left atrium through the pulmonary vein. Then it goes to the left ventricle and then to the body through aorta.
6. I think that dancer B will have a quicker blood flow because they are moving more so their muscles need the oxygen. Dancer A will have a much slower blood flow because they are not moving as much, which means that their muscles don't require as much oxygen to function.
7. (a) It is responsible for carrying oxygen and carbon dioxide. (b) It is responsible for clotting of blood.
8. Stroke volume is the volume of blood leaving the heart in one contraction.
9. Cardiac Output is the volume of blood leaving the heart in one minute.
10. (a) 5.950 L ; (b) 8.250 L; (c) 13.950 L.
11. Arteries have a thick outer wall and a thick inner layer of muscle. In the centre there is a narrow hole (tube). Veins have a thin outer wall, and a thin inner layer.
12. (a) temporal and radial
13. Haemoglobin is a chemical inside red blood cells, that helps to connect the oxygen with the red blood cells.