**Question:** Which of the following cell types is least sensitive to anoxia?

A. Neurons
B. Red blood cells
C. Skeletal muscle cells
D. Liver cells

**Core Concept:** Anoxia refers to the deprivation of oxygen supply to tissues or cells, leading to cellular dysfunction and potential damage. Different cell types exhibit varying degrees of tolerance to oxygen deprivation due to their unique physiology and energy requirements.

**Why the Correct Answer is Right:**
Skeletal muscle cells (option C) are less sensitive to anoxia compared to other cell types. This is because they primarily rely on glycolysis for energy production, which is less sensitive to oxygen deprivation compared to aerobic respiration. Glycolysis can continue to some extent even in the absence of oxygen, whereas oxidative phosphorylation requires oxygen for ATP synthesis.

**Why Each Wrong Option is Incorrect:**
1. Neurons (option A) are highly sensitive to anoxia due to their high energy demands and dependence on oxidative phosphorylation for ATP production. Neurons require a constant supply of energy to maintain ion gradients, synaptic transmission, and neuronal communication.
2. Red blood cells (option B) are not directly affected by anoxia, but they become less efficient in transporting oxygen as oxygen levels decrease, leading to a negative impact on tissues and cells relying on oxygen for energy production.
3. Liver cells (option D) can be affected by anoxia, but they are generally more resistant than neurons due to their ability to switch to anaerobic glycolysis when oxygen levels are reduced. However, they are still more sensitive than skeletal muscle cells.

**Clinical Pearl:** The understanding of cellular sensitivity to anoxia is crucial in clinical scenarios like ischemic stroke, where cerebral tissue may be deprived of oxygen. Early recognition and treatment of stroke patients can potentially limit tissue damage and improve outcomes.

**Correct Answer:** D (Liver cells)