The diagram given below represents a section of the human heart

The diagram given below represents a section of the human heart. Answer the questions that follow:

1. Which parts of heart are in the diastolic phase? Give a reason to support your answer.
2. Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
3. What causes the heart sounds ‘LUBB’ and ‘DUP’?
4. Name the blood vessels that supply oxygenated blood to the heart muscles.
5. Draw neat labelled diagrams of a cross section of an artery and a vein.

Answer

1. Ventricles
   Tricuspid and Bicuspid valves are open / semilunar valves are closed.
2. 1. Pulmonary artery, Deoxygenated blood.
   2. Pulmonary veins, Oxygenated blood.
3.  LUBB – Closure of Tricuspid and bicuspid valves.
   DUP – Closure of semilunar valves
4. Coronary arteries
5.