cardiovascular system

Question 1

what is the sequence of the conduction system

Answer 1

sa node
atrial systole
av node
bundle of his
purkinje fibres
ventricular systole

Question 2

what is atrial systole

Answer 2

contraction of the right and left atria at the same time, the bp will go up and the blood will be forced out into the ventricles

Question 3

what is ventricular systole

Answer 3

contraction of the left and right ventricles causing an increase in bp. in left ventricle the aortic valvue will open and oxygenated blood will be ejected

Question 4

what is cardiac diastole

Answer 4

period of time when the heart relaxes after a contraction in preparation for refilling with circulating blood.

Question 5

what is ventricular disatole

Answer 5

ventricles relax

Question 6

what is atrial diastole

Answer 6

atria relax

Question 7

what happens to the impulse from the SA node

Answer 7

the impulse spreads through the walls of the atria causing them to contract (systole) and force the blood into the ventricles

Question 8

what happens at the av node

Answer 8

it delays the transmission of the impulse for 0.1s to enable the atria to fully contract

Question 9

what happens to the impulse after the av node

Answer 9

ventricular systole begins and the impulse is passed down specialised fibres which form the bundle of his

Question 10

sam aliano always bakes pretty victoria sponges

Answer 10

sa node, atrial systole, av node, bundle of his, purkinje fibres, ventricular systole

Question 11

path of blood

Answer 11

sup/in vena cava
right atrium
tricuspid valve
right ventricle
pulmonary valve
pulmonary artery
LUNGS
pulmonary vein
left atrium
bicuspid/mitrial valve
left ventricle
aortic valve
aorta

Question 12

what do valves do

Answer 12

prevent backflow and ensure blood flows in one direction

Question 13

what are the semilunar valves

Answer 13

aortic and pulmonary

Question 14

what is the difference between the tri and bicuspid valves

Answer 14

tri has 3 flaps and bi has 2

Question 15

why is the left side more muscular

Answer 15

because it needs more force to get the blood out of the heart and to the extremities rather than just to the ventricles

Question 16

what happens at the sa node

Answer 16

cardiac impulse is initiated from this specialised bundle of cells. the impulse travels through atria walls causing both to contract

Question 17

what does the bundle of his split into

Answer 17

left and right bundle branch

Question 18

what do the left bundle branch do

Answer 18

carries electrical impulse around left ventricle wall

Question 19

what does the right bundle branch do

Answer 19

carries the electrical impulse around the right ventricle wall

Question 20

where is the sa node located

Answer 20

of the right atrial wall (top)

Question 21

what does sa node mean

Answer 21

sinoatrial node

Question 22

what does av node mean

Answer 22

atrioventricular node

Question 23

what is the purpose of the vascular shunt mechanism

Answer 23

to redistribute blood around the body

Question 24

the distribution of blood to the brain is…..

Answer 24

always the same