Circulatory system - the heart

Question 1

is the heart a single circulatory system

Answer 1

double

Question 2

what is the circulatory system made up of

Answer 2

the heart
blood vessels
blood

Question 3

what happens in the first circuit

Answer 3

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

Question 4

what happens in the second circuit

Answer 4

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

Question 5

how does the heart pump blood around the body

Answer 5

it contracts

Question 6

what are the walls mainly made up of

Answer 6

tissue

Question 7

what do the valves do

Answer 7

make sure the blood is going in the right direction

Question 8

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

Answer 8

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

Question 9

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

Answer 9

coronary arteries

Question 10

what controls your heart rate

Answer 10

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

Question 11

what does the ‘pacemaker’ do

Answer 11

produces small electric impulses that cause the muscles to contract