Events of the cardiac cycle

Question 1

Does systole mean contraction or relaxation?

Answer 1

contraction

Question 2

Does diastole mean contraction or relaxation?

Answer 2

relaxation

Question 3

Are the valves in the heart unidirectional?

Answer 3

yes

Question 4

What are the 4 main valves in the heart and where are they located?

Answer 4

tricuspid (av valve) from right atrium to right ventricle
Pulmonary valve right ventricle to lungs
bicuspid valve (av valves, mitral) left atrium to left ventricle
aortic valve from left ventricle to aorta

Question 5

What are the 5 stages of the cardiac cycle and what happens in each stage?

Answer 5

atrial systole 
isovolumetric ventricular contraction  
ventricular ejection 
isovolumetric ventricular relaxation 
ventricular filling

Question 6

What happens during atrial systole?

Answer 6

atrial pressure increases opening of AV valve, atria empty blood into ventricles

Question 7

What happens during isovolumetric ventricular contraction

Answer 7

ventricular pressure increases causing AV valves to close. Ventricular pressure

Question 8

What happens during ventricular ejection?

Answer 8

ventricular pressure > aortic pressure causing aortic valve to open and blood to be ejected

Question 9

What happens during isovolumetric ventricular relaxation?

Answer 9

ventricular pressure atrial pressure so AV valve still closed

Question 10

What is the first heart sound associated with and what noise is made?

Answer 10

AV valve closing causing Lub sound

Question 11

What is the second heart sound associated with and what noise is made?

Answer 11

aortic/ pulmonary valve closure dup sound

Question 12

What is stenosis?

Answer 12

narrowing which causes a steep pressure gradient, high flow across valve