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A 34 year old athlete is participating in a marathon race .Following mechanism will account for transport of glucose into his muscle during running:Select one:a. Primary active transportb. Counter-transportc. Facilitated diffusiond. Simple Diffusion

Question

A 34 year old athlete is participating in a marathon race .Following mechanism will account for transport of glucose into his muscle during running:Select one:a. Primary active transportb. Counter-transportc. Facilitated diffusiond. Simple Diffusion

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Solution

The correct answer is c. Facilitated diffusion.

Here's why:

Glucose transport into cells (including muscle cells) is primarily mediated by a family of glucose transporters (GLUT). In the case of muscle cells, the GLUT4 transporter is particularly important.

During exercise, like running a marathon, the demand for glucose in muscle cells increases. To meet this demand, the body has a mechanism to increase the amount of GLUT4 on the surface of muscle cells, thereby increasing the rate of glucose uptake.

This process does not require energy, as glucose is moving down its concentration gradient from the blood (where glucose concentration is high) into the muscle cells (where glucose concentration is low). Therefore, it is not a form of active transport (which requires energy).

Instead, this process is a form of facilitated diffusion, where a transporter (GLUT4) facilitates the movement of glucose across the cell membrane.

So, the transport of glucose into the muscles of a 34-year-old athlete during a marathon would be best described as facilitated diffusion.

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