Cardiovascular System 1 Flashcards
(18 cards)
what does the cardiovascular system transport
oxygen, carbon dioxide and nutrients around the body in the bloodstream
what does the cardiovascular system give the muscles
they get what they need to release energy during exercise and take away any waste products
why can you exercise for a long time without overheating
more blood is moved nearer to the skin to cool the body more quickly
what is the cardiovascular system made up of
the heart, blood and blood vessels
what are the main types of blood vessels
arteries, veins and capillaries
why does blood need to circulate around the body during physical activity
to deliver oxygen and glucose to your muscles and to take carbon dioxide away from them
how does deoxygenated blood enter the right atrium
from the vena cava as the heart relaxes
what happens when the right atrium contracts
blood is pushed through a valve into the right ventricle
what happens when the right ventricle contracts
blood is pushed through another valve into the pulmonary artery which carries blood to the lungs
how does oxygenated blood enter the left atrium
from the pulmonary vein as the heart relaxes
what happens when the left atrium contracts
blood is pushed through a valve into the left ventricle
what happens when the left ventricle contracts
blood is pushed through another valve into the aorta which transports oxygenated blood to the rest of the body and the muscles
when does the blood become deoxygenated
when the muscles have used the oxygen in the blood
what is a diastole
when the heart relaxes and fills with blood
what is a systole
when the heart contracts and pumps the blood out
what is one cardiac cycle
a phase of diastole and systole where both sides of the heart relax and contract at the same time
why does blood flow
a difference in pressure caused by the cardiac cycle
what is the function of valves
valves open to let blood fill the heart chambers and close to prevent backflow
