The valves are responsible for preventing blood from flowing in the wrong direction, they are present in the veins, and the arteries don't need them because the aorta (biggest artery) pumps or in other words pushes it with such a force that no other force can change its direction, in the veins there is no structure present for pumping them as a result we have got valves so that they go in one direction...... the meaning of the word valve is to allow in one direction
The answer is haploid because they have half as many chromosomes(21) as diploid cells which are somatic or body cells. Haploid cells are things like sperm which combine with the female reproductive cell to make a 42 chromosome human cell.
It will make the athletse's muscles produce lactid acid. By which his muscle might become very tired and ache, and the athlete might do the exercice he's doing slower.
