Lesson 5

• 1) transport oxygen
• 2) remove carbon dioxide
• 3) transport chemical mediators
• 4) thermoregulation
• 5) transport leukocytes

Major structures of the heart are the superior and inferior vena cava, the left and right atriums, left and right ventricles, and pulmonary arteries, veins, and capillaries, and the aorta.

The superior and inferior vena cava carry oxygen poor blood from veins to the right atrium, the right atrium moves blood through the tricuspid valve to the right ventricle. Then the right ventricle contracts and pumps blood through the pulmonary semilunar valve and into the pulmonary trunk. The pulmonary trunk moves oxygen poor blood into the pulmonary arteries which go into the lungs. Pulmnonary capillaries located in the lungs conduct a gas exchange, allowing oxygen to enter the blood while carbon dioxide leaves it. Pulmonary veins take the now oxygen rich blood to the left atrium. The left atrium pumps blood to the bicuspid valve to the left ventricle. The left ventricle sens blood into the aorta.

1) lymph vessel; 2) lymph nodes; 3) white blood cells; 4) bone marrow; 5) lymph organs including tonsils, spleen, and thymus.

diuretic

angina

atherosclerosis

aneurysm

congestive heart failure

The first heart sound.

True

systole of the ventricles