Question

26- Explain why it is right to argue that the transport of glucose across the apical membrane of 27- Base on the role of the liver as a regulator of blood glucose, explain the physiological importance 28-Some cells have aquaporins (channels that facilitate the flow of water molecules through the intestinal epithelial cells is ultimately powered by ATP hydrolysis. of its glucose transporter being a passive transporter. plasma membrane). For these cells, what regulates the rate and direction of water diffusion across the membrane? a. Aquaporin conformation b. Resting membrane potential c. Solute concentrations on either side of the membrane d. Availability of ATP 29- For each of the following sentences, fill in the blanks with the best word or phrase selected from the list below. Not all words or phrases will be used; each word or phrase should be used only once.

Answer 1

Answer

26) Glucose transportation depends on cell types, in some cells of body glucose is transpoted across the cell membrane by facilitated diffusion (no need of energy), but in case of intestinal epithelial cells, glucose is transported by active transport (using energy from ATP hydrolysis) from gut, against the concentration gradient. It is not matter how much is the concentration of glucose in epithelial cells, epithelial cells lining the gut need to bring more and more glucose made available from digestion into the body and must prevent the reverse flow of glucose from body to gut. Thus, it is right to argue that the transport of glucose across the apical membrane of intestinal epithelial cells is ultimately powered by ATP hydrolysis.

27) Liver is a regulator of blood glucose, liver is a mojar site for synthesis, storage and redistribution of carbohydrates. After meal, it take glucose from blood stream via glucose transporter (facilitated diffusion- not need energy) and converted it into glycogen and store it. Due to any reason, if glucose is low in blood stream, liver release gluocse in blood stream via glucose transporter by breaking glycogen or by gluconeogenesis. GLUT2 is the type of glucose transporters found in liver cells to uptake glucose for glycolysis, and release of glucose during gluconeogenesis.