heart structure

Question 1

describe the heart

Answer 1

• Hollow 4 chambered muscular organ
• Atria and ventricules – left and right separated by interatrial or interventrical septum
• Lined by the pericardium – double walled sac

Question 2

left side

Answer 2

provides oxygenated blood to the body (systemic circulation)

Question 3

right side

Answer 3

– provides de-oxygenated blood to the lungs to be oxygenated (pulmonary circulation)

Question 4

cardiac output

Answer 4

heart rate x stroke volume

Question 5

follow the path of the deoxygenated blood

Answer 5

• DO blood come into the right atrium from superior and inferior vena cava
• moves into the right ventricles through tricuspid valve (which closes when the ventricles contract to prevent regurgitation)
• moves to the pulmonary trunk before bifurcates into right and left pulmonary arteries to the pulmonary circulation through the pulmonary or semilunar valve.
• re-enters the heart through the pulmonary vein to the left atrium
• left ventricle through the mitral or bicuspid valve (similar to tricuspid, it closes during ventricular contract because of papillary muscles which are secured to ventricular wall).
• aorta through the aortic valve.