Question

Answer the following

Answer 1

Answer:

Explanation:

1. heart beat is the regular movement or sound of the heart as it sends blood round the body

2. valves prevent the backflow of blood.

3. when blood enters in heart twice to complete its cycle. For e.g deoxygenated blood enters in right side (first time)of heart that is pumped into lungs and in lungs, it get oxygenated and rush back into left chambers heart (second time) .

4.pulmonary artery carries deoxygenated blood from right ventricles to lungs.

while pulmonary vein carries oxygenated blood from lungs to left atria of heart

5. haemoglobin is iron containing protein which binds with oxygen and helps in transport of oxygen throughout of body