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Which of these is true about the metabolism of glucose?

A.

Aerobic metabolism produces lactic acid.

B.

Anaerobic metabolism produces lactic acid.

C.

Anaerobic metabolism produces carbonic acid.

D.

Both A and C are true about the metabolism of glucose.

Answer and Explanation

The Correct Answer is B

A. Aerobic metabolism produces lactic acid: Aerobic metabolism (with oxygen) produces carbon dioxide, water, and ATP, not lactic acid.

B. Anaerobic metabolism produces lactic acid: When oxygen is scarce, cells switch to anaerobic pathways, which result in the byproduct of lactic acid.

C. Anaerobic metabolism produces carbonic acid: Carbonic acid is formed when CO2 (from aerobic metabolism) dissolves in water.

D. Both A and C are true: This is incorrect as both A and C describe the wrong metabolic pathways for those products.


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Related Questions

Correct Answer is A

Explanation

A. cardiac inhibition: The Vagus nerve (part of the parasympathetic system) releases acetylcholine to slow the heart rate, a process known as cardiac inhibition.

B. coronary inhibition: This term is not standard; coronary usually refers to the blood vessels of the heart.

C. vagal inhibition: The Vagus nerve performs the inhibition, but the effect is on the heart (cardiac).

D. autonomic inhibition: While correct in a broad sense, "cardiac inhibition" is the more specific clinical/anatomical term for this braking action.

Correct Answer is C

Explanation

A. usually involves the endocrine or nervous system: This describes extrinsic control, where signals come from outside the specific organ.

B. operates at the cellular level: While it involves cells, intrinsic control is specifically defined by an organ or tissue regulating itself.

C. is sometimes called autoregulation: Intrinsic control refers to "built-in" mechanisms within an organ that allow it to adjust its function without outside help (e.g., blood flow regulation within the heart).

D. operates at the system or organism level: This describes extrinsic or systemic regulation.

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