33.1: The Circulatory System

Question 1

myocardium

Answer 1

thick middle muscle layer of the heart

Question 2

atrium

Answer 2

upper chamber of the heart that receives blood from the rest of the body

Question 3

ventricle

Answer 3

lower chamber of the heart that pumps blood out of heart to the rest of the body

Question 4

valve

Answer 4

flap of connective tissue located between an atrium and a ventricle, or in a vein, that prevents backflow of blood

Question 5

pulmonary circulation

Answer 5

path of circulation between the heart and lungs

Question 6

systemic circulation

Answer 6

path of circulation between the heart and the rest of the body

Question 7

pacemaker

Answer 7

small group of cardiac muscle fibers that maintains the heart’s pumping rhythm by setting the rate at which the heart contracts; the sinoatrial (SA) node

Question 8

artery

Answer 8

large blood vessel that carries blood away from the heart to the tissues of the body

Question 9

capillary

Answer 9

smallest blood vessels; bring nutrients and oxygen to the tissues and absorbs carbon dioxide and waste products

Question 10

vein

Answer 10

blood vessel that carries blood from the body back to the heart