Notes

Blood that has traveled through the body supplying nutrients to tissues eventually returns to the heart through the superior vena cava (7) and the inferior vena cava (8).
Blood then enters the right atrium (1)
where a small contraction pushes blood through the tricuspid valve (A) and into the right ventricle (2).
From the right ventricle, blood is pushed out through the pulmonary valve (B)
and into
the pulmonary trunk (5). This artery branches into two arteries, the left pulmonary artery (5L)
and the right pulmonary artery (5R)which will deliver the blood to the lungs where it will become oxygenated.
Oxygenated blood returns from the lungs through the left and right pulmonary veins (9) which empties into the left atrium (3).
From the left atrium, blood goes through the bicuspid valve, which is also called the mitral valve (D) and enters the most muscular part of the heart, the left ventricle (4). A powerful contraction of the left ventricle will send blood through the aortic valve (C) and into the largest artery of the body, the aorta (6).
Blood enters the aorta and will travel to the head and shoulders through three smaller arteries 6a, 6b, and 6c.
1) Read the descriptions carefully and trace the flow of blood in the heart. Use a blue arrow to indicate deoxygenated blood and a red arrow to indicate oxygenated blood. (10 points)
2) Mitral regurgitation is a heart condition that occurs when the mitral valve does not close fully. Based on your knowledge of the heart, describe what happens to the blood of someone who has this condition. (If you are really stumped, look it up!) (2 points)