Explain two ways how blood cell A is structurally adapted to its function. It does not contain nucleus so it has more space to carry more haemoglobin. It is biconcave disc shape so it has a large surface area to volume ratio. Oxygen can diffuse rapidly across the cell membrane. A B C
Compare the thickness of the wall of right and left ventricles. What is the significance of the difference? Left ventricle has thicker wall than right ventricle. Left ventricle can provide greater force to pump blood to all parts of the body except lungs whereasright ventricle pumps blood only for a short distance to the lungs.
Which of the following cannot found in plasma? a.Water b.Glucose c.Starch d.Protein a.Water b.Glucose c.Starch d.Protein
Blood pressure in venae cavae is very low. Explain how a continuous blood flow is maintained. Valves in the venae cavae prevent backflow of blood. When the muscles lying next to the veins contract, they press against the veins. The veins are squeezed so blood flows forwards.