Which of the following tissues requires more oxygen ?

Options

A. Skin
B. Brain
C. Bone
D. Intestine

Answer

To determine which tissue requires more oxygen, we can follow these steps:

### Step 1: Understand the Oxygen Requirement of Different Tissues
- All tissues in the body require oxygen for cellular respiration, which is essential for energy production. However, the amount of oxygen required varies significantly among different tissues.

### Step 2: Identify Key Organs with High Oxygen Demand
- The major organs that are known to have high oxygen demands include:
- Brain
- Heart
- Liver
- Kidneys
- Skeletal muscles

### Step 3: Analyze the Oxygen Consumption of Each Organ
- The brain, despite being only about 1.5 kg of body weight, consumes approximately 50 ml of oxygen per minute, which is about 20% of the total oxygen used by a resting adult.
- The heart and skeletal muscles also require significant amounts of oxygen, especially during physical activity, but their demand decreases when at rest.
- The liver and kidneys also have high oxygen requirements, but they are not as constant as that of the brain.

### Step 4: Determine the Organ with the Highest Constant Oxygen Requirement
- The brain is unique in that its oxygen requirement remains high and constant, regardless of whether the body is at rest or active. This is because the brain is always active, controlling and coordinating bodily functions.

### Conclusion
- Based on the analysis, the tissue that requires the most oxygen is the **brain**. It consistently consumes a significant portion of the body's total oxygen supply, making it the most metabolically active organ.

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