Question

please give the reasons about them
please it urgent​

Answer 1

Answer:

Explanation:

a) The human heart has four chamber it is because to prevent mixing of oxygenated and deoxygenated blood and proper circulation of blood.

b) The lungs is the only place in our human body where CO2 in deoxygenated blood is exchanged O2 and then the blood is oxygenated so, CO2 rich blood has to reach our lungs for purification of blood.

c) Now the oxygenated blood has to be brought back to the heart so that it can pump back blood to all other body parts for their needs.

d) Ventricle have thicker muscles than atria because the function of atria is only to send and receive blood from the lungs but the function of ventricle is to supply blood to complete body so it needs more power so ventricle have thicker muscles than atria.

e) Valves are present in human heart because during circulation of blood there may be back flow of blood and it might disturb the unidirectional circulation of blood so valves helps to maintain this unidirectional circulation of blood.