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.
Explain how the kidneys serve as the main osmoregulatory organs in mammalian systems. Describe the structure of the kidneys and the functions of the parts of the kidney. Describe how the nephron is the functional unit of the kidney and explain how it actively filters blood and generates urine. Detail the three steps in the formation of urine: glomerular filtration, tubular reabsorption, and tubular secretion.