Which part of the nephron from the following image is the main site of secretion for creatinine?

A. Increased afterload: Increased afterload, the resistance the heart must overcome to eject blood, typically reduces stroke volume because the heart has to work harder to push blood against higher pressure.

B. Decreased heart contractility: This would reduce stroke volume, as the heart would be less effective at pumping blood.

C. Increased preload: Preload refers to the volume of blood in the ventricles at the end of diastole. An increased preload stretches the heart muscle, which typically leads to a stronger contraction and higher stroke volume.

D. Decreased blood pressure: While low blood pressure may reduce afterload, it doesn't directly increase stroke volume unless other factors are at play.

A. Gametes are only found in males: This statement is incorrect; gametes (sperm and eggs) are found in both males and females.

B. Gametes have double the chromosomes: This is incorrect; gametes are haploid (having half the number of chromosomes), while somatic cells are diploid (having two sets of chromosomes).

C. Gametes do not go through cell division: Gametes are produced through meiosis, which is a type of cell division.

D. Gametes go through meiosis: Gametes are produced through meiosis, a specialized form of cell division that reduces the chromosome number by half, allowing for sexual reproduction.