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 nephron is composed of an initial filtering component and a tubule specialized for reabsorption and secretion. Composed of a glomerulus and Bowman's capsule, the renal corpuscle is the beginning of the nephron.ach kidney has over one million nephrons that are responsible for removing waste products from blood and maintaining water, salt and pH balance in the body. This vital job results in the formation of urine. 1.Afferent Arteriole The afferent arteriole receives blood rich in oxygen from the renal artery.