Question

The table below shows the level of structural organization in some living organisms. At what level would a human heart be classified in the structural organization chart?
A 1
B 2
C 3
D 4

Answer 1

In the structural organization of living organisms, a human heart would be classified at Level 4 (D), which is the "organ" level. Here is a brief overview of the levels of organization for context:

1. **Cellular Level (Level 1)**: Basic unit of life (e.g., muscle cells).
2. **Tissue Level (Level 2)**: Groups of similar cells working together (e.g., cardiac muscle tissue).
3. **Organ Level (Level 3)**: Structures made up of different tissues working together (e.g., heart).
4. **Organ System Level (Level 4)**: Groups of organs that function together (e.g., the cardiovascular system which includes the heart).

So, the correct answer is **D 4**.