Question

Describe the step by step process pertaining to how blood moves through the heart. Include the various structures in the heart that are important for this. Explain the relationship between blood plasma, interstitial fluid and lymph fluid

Answer 1

1.The deoxygenated blood enters the right side of the heart through two veins are superior vena cava and inferior vena cava.  

Purkinje fibers present in the heart they carry contraction impulse. For the contraction the SA node continuously passes electric impulse. Contraction of heart cell requires depolarization and repolarization of their cell membranes. The Electric impulse of the SA node carried throughout the heart by AV node. Electric impulses are important for the contraction of muscles. During the contraction of right atrium, the blood enters into the right ventricle (RV) via tricuspid valve. These valves play major role in heart, they stop the entry of blood from ventricle to atria. They are designed for one way blood flow, so during ventricle contraction they were locked. The deoxygenated blood send to lungs through pulmonary valve into pulmonary artery. Here pulmonary valve is also made for one way. It stops the back flow of blood from pulmonary blood in the artery. Heart receives oxygenated blood from the lungs by pulmonary veins and opens into left atrium. The left atrium contracts the blood moves to left ventricle through mitral valve. This is also sends blood in one way. The left ventricle pumps this oxygenated blood to all body parts though aortic valve by arota.

Interstitial fluid: it is fluid that surrounds the tissue.

Lymph is the fluid like substance that circulates throughout the lymphatic system of the body. The lymph capillaries absorb the interstitial fluid into lymph system in called lymph. If the Interstitial fluid enters into blood is called plasma.