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Answers
Answer:
ans a)The left atrium and right atrium are the two upper chambers of the heart. The left atrium receives oxygenated blood from the lungs. The right atrium receives deoxygenated blood returning from other parts of the body.
ans b)Their muscular walls are thicker than the atria because they have to pump blood out of the heart. ... This is because the left ventricle has to pump blood at a higher pressure so that it reaches all areas of the body (including the fingers and toes) but the right side only has to pump blood to the lungs.
ans c)Arteries carry blood away from the heart to the tissues of the body. Veins carry blood from the tissues of the body back to the heart. ... Arteries carry oxygenated blood expect pulmonary artery. Veins carry deoxygenated blood except pulmonary vein.
ans d)In four chambered heart, left half is completely separated from right half by septa. It serves following two purposes (a) ensures complete segregation of oxygenated and deoxygenated blood (i.e., no mixing). (b) allows a highly efficient supply of oxygenated blood to all parts of the body.
Answer:
a. Oxygenated blood is in left side of heart and deoxygenated blood is in right side of heart.
b. Ventricles have thicker walls as compare to atrias because they have to push the blood farther than the atrias.(Body and Lungs)
c. Arteries - Thicker walls, More pressure, No valves.
Veins - Thinner walls, Less pressure, Have valves.
d. The significance of four chambered heart are -
1. No mixing of venous or O2 rich blood.
2. More energy requirement is fulfilled.
3. Better Pumping of Blood.