Heart

Question 1

Briefly explain how the heart functions

Answer 1

Deoxygenated blood enters the right atrium from the body. It is then pushed, by muscles in the right ventricle, to the lungs where it is oxygenated. The oxygenated blood returns from the lungs to the left atrium, is pushed into the left ventricle and then out along the main blood vessel of the body, the aorta.

Question 2

State the key structures of the heart and lable them

Answer 2

Aorta
Right pulmonary artery
Superior vena cava
right pulmonary vein
Sinoatrial node
Semilunar valve
Right Atrium
Tricuspid valve
bundles of his
Inferior vena cava
Right ventricle
Purkinje fibres
Septem
left ventricle
Bicuspid valve
Left atrium 
Left pulmonary vein 
left pulmonary artery

Question 3

Give the equation for cardiac output

Answer 3

Cardiac output=heart rate x stroke volume

units = ml/minute

Question 4

State the function of:

• Aorta
• Right Pulmonary Artery
• Superior Vena Cava
• Right Pulmonary vein
• Sinoatrial node
• Bundle of His
• Inferior vena carva
• Purkinje Fibres

Answer 4

Aorta=Carries oxygenated blood to the body
Right Pulmonary Artery=Carries deoxygenated blood to right lung
Superior Vena cava=Carries deoxygenated blood from the upper body
Right Pulmonary vein=Carries Oxygenated blood from right lung
Sinoatrial node=Hearts pacemaker; responsible for the regular contraction of the heart muscle
Bundle of His=Transmits impulses from the AV node to the ventricles
Inferior vena cava=Carries deoxygenated blood from the lower and middle body
Purkinje Fibres=Send nerve impulses to the ventricles of the heart

Question 5

State the function of:
Left Pulmonary artery
Semilunar valve
Septum

Answer 5

Left Pulmonary artery=Carries deoxygenated blood to left lung
Semilunar Valve=Valves prevent backwards flow of blood
Septum=Divides left and right side of the heart