Вопрос
The mechanism of action of antidiuretic hormone is realized: Bbl6epuTe oguH OTBeT: a. due to the incorporation of proteases into the membranes of tubular epithelial cells b. due to the incorporation of aquaporins into the epithelial cell membranes of the tubules c. due to the activation of energy r-consuming water reabsorption processes d. due to an increase in the hydrostatic pressure of the intratubular fluid
Решения
4.7
(130 Голоса)
Флорентина
профессионал · Репетитор 6 лет
Ответ
The correct answer is b. due to the incorporation of aquaporins into the epithelial cell membranes of the tubules.Antidiuretic hormone (ADH), also known as vasopressin, is a hormone that plays a crucial role in regulating water balance in the body. Its primary mechanism of action is to increase water reabsorption in the kidneys, which helps to concentrate the urine and reduce water loss.The mechanism of action of ADH is realized through the incorporation of aquaporins into the epithelial cell membranes of the tubules. Aquaporins are water channels that facilitate the movement of water molecules across cell membranes. When ADH binds to its receptors on the cells of the collecting ducts and distal tubules in the kidneys, it triggers a signaling cascade that leads to the insertion of aquaporins into the cell membranes. This increases the permeability of the cells to water, allowing more water to be reabsorbed from the filtrate back into the bloodstream.Option a is incorrect because proteases are enzymes that break down proteins, and their incorporation into the membranes of tubular epithelial cells is not the mechanism of action of ADH.Option c is incorrect because while energy-consuming water reabsorption processes may occur in the kidneys, they are not the primary mechanism of action of ADH.Option d is incorrect because an increase in the hydrostatic pressure of the intratubular fluid is not the mechanism of action of ADH.