Determine the direction of blood flow through the chambers, vessels and valves of the heart and lungs. Summarize your findings below beginning with oxygen-poor blood from the body entering the heart and ending with oxygen-rich blood leaving the heart to re-supply the body. 1 Vena cavae (vessels) 8 (vessels) 2 Right atrium (chamber) 9 (chamber) 3 (valve) 10 (valve) 4 (chamber) 11 (chamber) 5 (valve) 12 (valve) 6 (vessels) 13 (vessels) 7 Through the lungs (O2 picked up) 14 Through the body (O2 released)

1 Vena cavae (vessels)

2 Right atrium (chamber)

3 Tricuspid valve (valve)

4 Right ventricule (chamber)

5 Pulmonary valve (valve)

6 Pulmonary artery (vessels)

7 Through the lungs (O2 picked up)

8 Pulmonary veins (vessels)

9 Left atrium (chamber)

10 Mitral valve (valve)

11 Left ventricle (chamber)

12 Aortic valve (valve)

13 Aorta (vessels)

14 Through the body (O2 released)

Explanation:

The oxygenated blood travels through the arteries distributing oxygen to the cells. Then the deoxygenated blood goes through the veins and to the heart and the lungs.

The deoxygenated blood enters the heart through the vena cavae. From there, it goes to the right atrium. The accumulation of blood in the right atrium opens the tricuspid valve, and the blood goes to the right ventricle. Between the right ventricle and the pulmonary vein, it is the pulmonary valve. The valve stops blood from going back to the ventricle once it is in the pulmonary artery. The pulmonary artery carries the blood to the pulmonary arterioles and these to the pulmonary capillaries, where the blood picks up oxygen and releases carbon dioxide. This process happens in the lungs.

Once that the blood has oxygen, it goes from the capillaries to the pulmonary venules. Then, to the pulmonary vein. The pulmonary vein brings the blood to the left atrium, then it goes through the mitral valve and flows to the left ventricle. Between the left ventricle and the aorta, it is the aortic valve. A valve that stops the blood from going back to the ventricle once it went to the aorta. From the aorta, the oxygenated blood goes to the rest of the body.

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.

b. the carbon cycle ensures living things have a source of hydrogen