Which of These Is an Example of Active Transport

question 62

Multiple Choice

Which of these is an example of active transport?

• A)diffusion of oxygen from a place of high concentration to a place of lower concentration
• B)facilitated diffusion of K+
• C)transport of glucose down its concentration gradient
• D)transport of Na+ from a place of low concentration to a place of higher concentration
• E)transport of Cl- following its concentration gradient

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Definitions:

Active Transport

The movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Facilitated Diffusion

Carrier-mediated process that does not require ATP and moves substances into or out of cells from a high to a low concentration.

Proximal Convoluted Tubule

The proximal convoluted tubule is part of the nephron in the kidney, playing a crucial role in the reabsorption of water, ions, and nutrients back into the bloodstream.

Glucose Reabsorption

The process by which the kidneys filter glucose from urine back into the bloodstream.