Circulatory System

Question 1

microscopic vessels that continue from capillaries and merge to form veins.

Answer 1

venules

Question 2

thinner-walled blood vessels that carry deoxygenated blood and waste-laden blood from capillaries back to the heart

Answer 2

veins

Question 3

the smallest blood vessels that connect arterioles with the venules

Answer 3

capillaries

Question 4

small blood vessels between the arteries and capillaries

Answer 4

arterioles

Question 5

part of the heart that permits the blood to be pumped from the left ventricle into the aorta

Answer 5

aortic semilunar valve

Question 6

part of the heart that allows blood to flow from the left atrium into the left ventricle

Answer 6

bicuspid or mitral valve

Question 7

part of the heart that directs blood from the right ventricle into the pulmonary arteries

Answer 7

pulmonary semilunar valve

Question 8

part of the heart that allows blood to flow from the right atrium into the left ventricle

Answer 8

tricuspid valve

Question 9

the wall that separates the heart’s chambers

Answer 9

septum

Question 10

double-layered membrane that encloses the heart

Answer 10

pericardium

Question 11

protective outer layer of the heart

Answer 11

epicardium

Question 12

cardiac muscle

Answer 12

myocardium

Question 13

thin, innermost layer of the heart

Answer 13

endocardium