This organ is the body's largest.

Question

BlackTom AI · Accepted Answer

The skin is the body's largest organ by both surface area and overall mass, so the correct answer is d. Skin.

Relevant knowledge points and concepts:
- An organ is a group of tissues with a specific function. Size can be measured by surface area and mass.
- The skin covers the entire external surface of the body, protecting internal structures, regulating temperature, and sensing the environment.
- Other choices (bones, heart, intestines) are organs or organ systems, but none exceed the skin in overall size.

Step-by-step reasoning:
1. Identify what “largest” means in human anatomy: commonly taken as the organ with the greatest external surface area and substantial mass.
2. The skin envelops the whole body; in an average adult its surface area is roughly 1.5–2.0 square meters, and it represents a significant portion of body mass. This extensive coverage makes it the single largest organ.
3. Compare alternatives:
   - Heart: a single muscular organ whose primary role is pumping blood. Its mass (a few hundred grams) and volume are far smaller than the skin’s total mass and area.
   - Intestines: long tubular organs with large internal surface area for absorption, but they do not cover the body externally and their combined mass and external area are less than the skin’s.
   - Bones: each bone is an organ, and the skeletal system collectively is large, but bones do not form a single continuous organ that exceeds the skin in surface area; bone tissue is distributed in many pieces rather than one covering organ.

Why the correct answer is correct:
Skin uniquely covers the entire body and provides multiple large-scale functions (protection, thermoregulation, sensation), making it the largest single organ in measurable terms.

Why the other options are incorrect (brief):
- Bones: many organs (bones) rather than one large covering organ; total function differs.
- Heart: much smaller single organ.
- Intestines: extensive length but not the largest external organ or mass compared to skin.

Conclusion: This confirms the correct choice is d. Skin.

This organ is the body's largest.单项选择题

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