Pls solve 5a

Dear Student

(i) Ventricular systole.

(ii) Ventricles are contracting in this phase because bicuspid and tricuspid valves are closed while semilunar valves are open.

(iii) 1 - Pulmonary artery 
2 - arota 
3 - Semilunar valve
4 - bicuspid valve

(iv) 2 - arota. Oxygenated blood flows through it.

(v) 5  - pulomnary semilunar valve . It prevents backflow of blood into right ventricle at the time of  ventricular systole.

(vi) Pericardium covers heart.

Regards