The process by which small electrolytes are absorbed

a)
Facilitated transport

b)
Passive transport

c)
Active transport

d)
Simple diffusion

Correct answer is option 'D'. Can you explain this answer?

Question

The process by which small electrolytes are absorbeda)Facilitated transportb)Passive transportc)Active transportd)Simple diffusionCorrect answer is option 'D'. Can you explain this answer?

Answer

The process by which small electrolytes are absorbed is simple diffusion.

Explanation:
Simple diffusion is a process by which small molecules or ions move from an area of higher concentration to an area of lower concentration without the need for a carrier protein or energy input. Small electrolytes such as ions can passively diffuse across membranes through protein channels or through the lipid bilayer. This process is important for the absorption of small electrolytes from the gastrointestinal tract, as well as for their movement across cell membranes throughout the body.

Facilitated transport involves the use of a carrier protein to move molecules across a membrane, while active transport requires energy input to move molecules against their concentration gradient. Passive transport, on the other hand, refers to the movement of molecules down their concentration gradient without the need for energy input.

Therefore, the correct answer is option D, simple diffusion.

Answer

Simple diffusion... Refer ncert bio class 11 pg no 264....

Answer

Answer

Sodium is absorbed into the cell by several mechanisms, but chief among them is by cotransport with glucose and amino acids - this means that efficient sodium absorption is dependent on absorption of these organic solutes. Absorbed sodium is rapidly exported from the cell via sodium pumps - when a lot of sodium is entering the cell, a lot of sodium is pumped out of the cell, which establishes a high osmolarity in the small intercellular spaces between adjacent enterocytes. Water diffuses in response to the osmotic gradient established by sodium - in this case into the intercellular space. It seems that the bulk of the water absorption is transcellular, but some also diffuses through the tight junctions. Water, as well as sodium, then diffuses into capillary blood within the villus. As sodium is rapidly pumped out of the cell, it achieves very high concentration in the narrow space between enterocytes. A potent osmotic gradient is thus formed across apical cell membranes and their connecting junctional complexes that osmotically drives movement of water across the epithelium. Water is thus absorbed into the intercellular space by diffusion down an osmotic gradient. However, looking at the process as a whole, transport of water from lumen to blood is often against an osmotic gradient - this is important because it means that the intestine can absorb water into blood even when the osmolarity in the lumen is higher than osmolarity of blood.

Answer

D

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