Question

(IV) Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet
the blood flows in one direction only. Can you explain why?
(V) Distinguish between uniform and non-uniform motion.
for dispersal by water?​

Answer 1

Answer:

because in capillaries blood flows from downward to upward so to prevent back movement of blood there are valves. and in veins blood moves from upward to downward with pressure

Answer 2

Explanation:

When thyroid hormone levels are low (hypothyroidism), your body doesn't break down and remove LDL cholesterol as efficiently as usual. LDL cholesterol can then build up in your blood. Thyroid hormone levels don't have to be very low to increase cholesterol.