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Holding a book steady using an outstretc...

Holding a book steady using an outstretched arm is an example for

A

concentric isotonic muscle contraction

B

isometric muscle contraction

C

eccentric isotonic muscle contraction

D

failure of muscle contraction

Text Solution

AI Generated Solution

The correct Answer is:
To determine the type of muscle contraction involved in holding a book steady with an outstretched arm, we need to analyze the different types of muscle contractions. ### Step-by-Step Solution: 1. **Understanding Muscle Contractions**: Muscle contractions can be categorized into two main types: isometric and isotonic contractions. 2. **Isometric Contraction**: In an isometric contraction, the muscle length does not change while the muscle is under tension. This means that even though the muscle is active, it is not shortening or lengthening. 3. **Isotonic Contraction**: Isotonic contractions involve a change in muscle length. This type is further divided into: - **Concentric Contraction**: Where the muscle shortens as it contracts (e.g., lifting a weight). - **Eccentric Contraction**: Where the muscle lengthens while contracting (e.g., lowering a weight). 4. **Analyzing the Scenario**: In the scenario of holding a book steady with an outstretched arm, the arm is held in a fixed position. There is no movement of the arm up or down, and therefore, the muscle length remains constant. 5. **Conclusion**: Since the muscle length does not change while holding the book steady, this is an example of **Isometric Muscle Contraction**. ### Final Answer: Holding a book steady using an outstretched arm is an example of **Isometric Muscle Contraction**. ---
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