Question

Common name of convective transport

• A. Endocytosis
• B. Active transport
• C. Passive transport
• D. Pore transport

Hint:

Convective or pore transport is important in drug absorption of small hydrophilic molecules, especially across leaky membranes like those in the renal glomerulus or small intestine.

Answer 1

The Correct Option is D

Convective transport refers to the movement of solute molecules along with the flow of solvent (usually water) through aqueous pores or channels present in biological membranes. This mechanism is also known as pore transport or bulk flow. Key features of convective (pore) transport: - Occurs through aqueous pores or channels in the membrane.
- Involves small, water-soluble, and low molecular weight molecules (e.g., urea, electrolytes).
- No energy requirement—it is a type of passive transport driven by pressure gradients or bulk fluid movement.
- Common in capillaries and renal glomerular filtration processes.
Let’s assess the options: - Endocytosis involves vesicle formation and is an active, energy-dependent process.
- Active transport uses energy (ATP) to move substances against a concentration gradient.
- Passive transport includes diffusion but not necessarily pore-mediated transport.
- Pore transport is the correct equivalent term for convective transport.
Hence, the common name for convective transport is pore transport.

Answer 2

Convective transport describes solute molecules being swept along with bulk solvent flow through a membrane, and the question wants the everyday name used for this process. Checking what each term actually describes settles it.

1. Endocytosis: Endocytosis is when the cell membrane engulfs material into a vesicle, an active, energy-requiring process. It has nothing to do with solvent flow through pores.
2. Active transport: Active transport moves molecules against their concentration gradient using ATP energy, through specific carrier proteins. This is a distinct mechanism from bulk solvent-driven movement.
3. Passive transport: Passive transport is a broad umbrella term covering simple diffusion, facilitated diffusion, and other gradient-driven movements. It is too general a term to be the specific common name for convective, pore-driven flow.
4. Pore transport: Small, water-soluble molecules get carried along with bulk water as it moves through aqueous membrane pores, driven by a pressure or bulk flow gradient rather than by their own individual diffusion. This bulk, solvent-carried movement through pores is exactly what convective transport is commonly called.

The mechanism the question describes, solutes riding along with solvent flow through channels, matches the everyday term pore transport most closely.

So the correct answer is Pore transport.