Circulatory System

Question 1

The heart is located in the (blank)

Answer 1

thorax

Question 2

inner portion lying directly to the heart

Answer 2

visceral pericardium

Question 3

a serous sac surrounding the heart

Answer 3

pericardium

Question 4

outer portion of the pericardium

Answer 4

parietal pericardium

Question 5

heart muscle, forms the bulk of the heart

Answer 5

myocardium

Question 6

inner lining of the heart

Answer 6

endocardium

Question 7

thin-walled; separated by the interatrial septum, receiving chamber

Answer 7

right and left atrium

Question 8

thick-walled; separated by the interventricular septum, pumping chamber

Answer 8

right and left ventricle

Question 9

prevents the backflow of blood to the ventricles

Answer 9

semilunar valves (pulmonary and aortic)

Question 10

prevents backflow of blood into the atria, these valves are under high pressure

Answer 10

atrioventricular valve (tricuspid and mitral)

Question 11

carries deoxygenated blood to the lungs, for gas exchange

Answer 11

pulmonary trunk

Question 12

carries oxygen-rich blood to the general circulation

Answer 12

aorta

Question 13

carries deoxygenated blood to the right atrium

Answer 13

superior vena cava

Question 14

brings deoxygenated blood to the right atrium from the lower venous circulation

Answer 14

inferior vena cava

Question 15

4 veins lying posteriorly that bring oxygen blood to the left atrium from the lungs

Answer 15

pulmonary veins

Question 16

carries blood away from the heart; carries oxygenated blood only (except for the case of the pulmonary artery); with thick wall to cope with the pressure

Answer 16

arteries

Question 17

transport blood from small arteries to capillaries; with elastic fibers but more smooth muscle

Answer 17

arterioles (resistance vessel)

Question 18

drains blood from capillaries into veins, for return to the heart; important in inflammation because leukocytes can migrate through the walls.

Answer 18

venules

Question 19

site of exchange of nutrients and wastes between blood and tissue cells; walls are extremely thin

Answer 19

capillaries

Question 20

carry deoxygenated blood towards the heart (except pulmonary veins); the deoxygenated form of hemoglobin in venous blood makes it appear darker.

Answer 20

veins