More images of melasma ... Melasma is more common in women than in men; only 1-in-4 to 1-in-20 affected individuals are male, depending on the population studied. It generally starts between the age of 20 and 40 years, but it can begin in childhood or not until middle age.
Which structure in the kidneysâ nephrons is mainly responsible for the filtration of the blood? A. collecting duct B. loop of Henle C. glomerulus D. Bowmanâs capsule.pecialized cells regulate the expression of genes because they A. do not want the genes to become worn out. B. cannot control the translation of proteins. C. do not carry the complete genetic code in their nuclei. D. do not need the proteins that are specified by certain genes.
Each kidney in a human contains about a million nephrons. These nephrons make the actual changes to the blood composition.There are two types of nephron: cortical nephron and juxtamedullary nephron. The main difference in the two types of nephron is the length to which the loop of Henle extends into the kidney.Cortical nephron, which are about eighty percent of the nephron in humans, have a loop of Henle that does not extend past the cortex of the kidney.ach kidney in a human contains about a million nephrons. These nephrons make the actual changes to the blood composition.