Q- Method of transport of glucose in the intestine is?
A. Primary active transport
B. Secondary active transport
C. Simple diffusion
D. Counter transport
Answer is B. Secondary active transport
● Glucose is absorbed in small intestine by absorptive cells.
● In secondary active transport, also known as coupled transport or co-transport, energy is used to transport molecules across a membrane.
● This energy comes from the electrochemical gradient created by pumping ions out of the cell.
● The duodenum and upper jejunum absorb the bulk of the dietary sugars.
● Galactose and glucose are transported into the mucosal cells by an active, energy-requiring process that requires a concurrent uptake of sodium ions; the transport protein is the sodium-dependent glucose cotransporter 1 (SGLT-1).
Q- Potassium (K+) is the most abundant intracellular cation. Highest concentration of potassium is seen in:
A. Bile
B. Pancreatic juice
C. Ileal secretions
D. Rectum
Answer is D. Rectum
There is evidence that active potassium secretion occurs in the distal colon. This secretion combined with potassium in bacteria and colonic mucous in stool may explain the relatively high concentration of potassium, 50–90 mmol/L, in stool.
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Q- Slow conduction velocity is seen with which of the following nerve fibers?
A. Preganglionic autonomic nerve fibers
B. Postganglionic autonomic nerve fibers
C. Motor Nerve
D. Sympathetic nerve fibre
Answer is B. Postganglionic autonomic nerve fibers
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