Circulatory system - the heart Flashcards

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1
Q

is the heart a single circulatory system

A

double

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2
Q

what is the circulatory system made up of

A

the heart
blood vessels
blood

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3
Q

what happens in the first circuit

A

the right ventricle pumps deoxygenated blood to the lungs to take in oxygen and then returns it to the heart

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4
Q

what happens in the second circuit

A

the left ventricle pumps oxygenated blood around the other organs, the blood gives up its oxygen to cells and other organs and then returns to the heart to be pumped around again

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5
Q

how does the heart pump blood around the body

A

it contracts

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6
Q

what are the walls mainly made up of

A

tissue

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7
Q

what do the valves do

A

make sure the blood is going in the right direction

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8
Q

what are the four chambers and how does it use them th pump blood around

A

right and left atrium and right and left ventricle
1 - blood flows into the two atria from the vena cava and the pulmonary vein
2 - the atria contract pushing the blood into the ventricles
3 - they contract pushing the blood into the pulmonary artery and the aorta and out the heart
4 - blood then flows to the organs through arteries and returns through the veins
5 - the atria fill again and the whole cycle starts over

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9
Q

what branch off around the aorta and surround the heart making sure it has all the oxygenated blood it needs

A

coronary arteries

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10
Q

what controls your heart rate

A

group of cells in the right atrium that act as a pacemaker

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11
Q

what does the ‘pacemaker’ do

A

produces small electric impulses that cause the muscles to contract

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