The Heart Flashcards
What do heart valve do?
Heart valve only open one way and this depends on the pressure
Which wall is thicker and why?
The left ventricle is thicker because it creates pressure to pump blood all around the body
Why is the cardiac cycle controlled?
So that each chamber only contracts when it is full of blood
How can neves effect the heart beat?
The heart is not under any nervous control, but never can sometimes alter with the frequency of the heat beat
Where does the blood enter
The atria and ventricles, from pulmonary vein and the vena cava
What is the relaxation of the heart called
Diastole
What is also relaxed when the blood enters?
The atria are relaxed and filled with blood
Ventricles are also relaxed
What happens at the stage two of the heart
Contraction of atria
(Cattail systole)
Atria contact pushing blood into the ventricles (ventricles still relaxed)
Where does the blood pump to in stage 3 of the blood flow
The pulmonary arteries and the aorta
Contraction of ventricles systole
Atria is relaxed
Ventricles contract, pushing blood away from the heart through pulmonary arteries and the aorta
What is cardiac output
The amount of blood pumped around the body (depends on two factors)
What two factors does the cardiac output depend on
The stoke volume
The heart rate
What is the stoke volume
The volume of the blood pumped by the left ventricle into each heat beat
What is the heat rate
The number of times the heart beats per minute
What is a typical value for an adult for their strike volume
75ml
What is the typical value for an adult for their heart rate
70 bpm