ANATOMY

Detailed explanation-1: -Blood first enters the heart’s right atrium. A muscle contraction forces the blood through the tricuspid valve into the right ventricle. When the right ventricle contracts, blood is forced through the pulmonary semilunar valve into the pulmonary artery. Then it travels to the lungs.

Detailed explanation-2: -2. From the right atrium, blood flows through the tricuspid valve into the right ventricle. 3. The right ventricle pumps oxygen-poor blood through the pulmonary valve into the main pulmonary artery.

Detailed explanation-3: -The tricuspid valve ensures that blood flows from the right atrium to the right ventricle. It also prevents blood from flowing backward between those two chambers. When the right atrium fills, the tricuspid valve opens, letting blood into the right ventricle.

Detailed explanation-4: -The blood first enters the right atrium. The blood then flows through the tricuspid valve into the right ventricle. When the heart beats, the ventricle pushes blood through the pulmonic valve into the pulmonary artery. The pulmonary artery carries blood to the lungs where it “picks up” oxygen.