Which of the following properties is not associated with muscles of humans ?

Options

A. Exhibits both contractility and extensibility
B. Exhibits both excitability and elasticity
C. Endodermal in origin and about 20-30 percent of body weight
D. can classified on the basis of location, appearance and function

Answer

To solve the question "Which of the following properties is not associated with muscles of humans?", we will analyze each option provided and determine whether it is a characteristic of human muscles.

### Step 1: Analyze Option 1
**Option 1: Exhibit both contractibility and extensibility.**
- **Contractibility** refers to the ability of muscle cells to shorten forcefully.
- **Extensibility** refers to the ability of muscles to stretch.
- Both of these properties are indeed associated with human muscles.

**Hint:** Check if the properties mentioned are commonly known characteristics of muscle tissue.

### Step 2: Analyze Option 2
**Option 2: Exhibit both excitability and elasticity.**
- **Excitability** is the ability of muscle cells to respond to stimuli.
- **Elasticity** is the ability of muscles to return to their original length after being stretched.
- Both properties are also associated with human muscles.

**Hint:** Consider whether the properties are fundamental to muscle function.

### Step 3: Analyze Option 3
**Option 3: Endodermal in origin.**
- Human muscles are not endodermal; they are derived from the **mesoderm** during embryonic development.
- This statement is incorrect regarding human muscle origin.

**Hint:** Recall the three germ layers in embryonic development and their derivatives.

### Step 4: Analyze Option 4
**Option 4: Can classify it on the basis of location, appearance, and function.**
- Muscles can indeed be classified based on these criteria.
- The three major types of muscles are cardiac, smooth, and striated (skeletal) muscles.

**Hint:** Think about how muscles are categorized in biological studies.

### Conclusion
After analyzing all the options, we find that **Option 3: Endodermal in origin** is the property that is not associated with human muscles. Human muscles are mesodermal in origin.

### Final Answer
**The correct answer is Option 3: Endodermal in origin.**