Identify the structure of the muscle fiber as indicated by the arrow in the image.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
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**Question:**
Identify the structure of the muscle fiber as indicated by the arrow in the image.

**Image Description:**
The image shows a detailed model of a muscle fiber. The model is sectioned to display various structures, and an arrow points to a specific area highlighted in blue. Surrounding the arrow, branching structures are visible that resemble the contacting junctions between nerve fibers and muscle tissue.

**Options:**
- Synaptic cleft
- Motor end plate
- Myelin sheath
- Axon terminal

**Explanation:**
The arrow is pointing to a section of the muscle fiber model likely representing the neuromuscular junction area. This area involves the interaction between nerve endings and muscle fibers, crucial for muscle contraction. The options provided relate to parts of this junction:
  
- **Synaptic cleft**: The space between the nerve ending and the muscle fiber.
- **Motor end plate**: The specialized region of the muscle fiber membrane at the junction.
- **Myelin sheath**: An insulating layer surrounding nerve fibers, not directly part of the muscle fiber.
- **Axon terminal**: The end part of a nerve cell that releases neurotransmitters to communicate with the muscle fiber.

Based on the typical anatomy of a neuromuscular junction, the highlighted structure could reasonably be the motor end plate or the axon terminal, given these are direct interaction points in muscle fiber models.
Transcribed Image Text:**Question:** Identify the structure of the muscle fiber as indicated by the arrow in the image. **Image Description:** The image shows a detailed model of a muscle fiber. The model is sectioned to display various structures, and an arrow points to a specific area highlighted in blue. Surrounding the arrow, branching structures are visible that resemble the contacting junctions between nerve fibers and muscle tissue. **Options:** - Synaptic cleft - Motor end plate - Myelin sheath - Axon terminal **Explanation:** The arrow is pointing to a section of the muscle fiber model likely representing the neuromuscular junction area. This area involves the interaction between nerve endings and muscle fibers, crucial for muscle contraction. The options provided relate to parts of this junction: - **Synaptic cleft**: The space between the nerve ending and the muscle fiber. - **Motor end plate**: The specialized region of the muscle fiber membrane at the junction. - **Myelin sheath**: An insulating layer surrounding nerve fibers, not directly part of the muscle fiber. - **Axon terminal**: The end part of a nerve cell that releases neurotransmitters to communicate with the muscle fiber. Based on the typical anatomy of a neuromuscular junction, the highlighted structure could reasonably be the motor end plate or the axon terminal, given these are direct interaction points in muscle fiber models.
**Question:** Identify the structure of the muscle fiber as indicated by the arrow in the image.

**Image Description:** The image shows a model of a muscle fiber. A black arrow points to a specific structure within the model. The model uses several colors to represent different sections:

- Gray lines are parallel and extend horizontally across the top of the image.
- A prominent yellow network covers the model, resembling the sarcoplasmic reticulum.
- Red sections are interspersed, likely representing mitochondria or other cellular components.

**Options:**
- ○ I band
- ○ A band
- ○ Z disc
- ○ H zone

**Explanation:**

- **I Band:** The light band composed of actin filaments only.
- **A Band:** The dark band where actin and myosin filaments overlap.
- **Z Disc:** The boundary structure of the sarcomere, where actin filaments are anchored.
- **H Zone:** The central part of the A band where only myosin is present, visible during muscle relaxation.

Select the correct option based on the indicated structure in the model.
Transcribed Image Text:**Question:** Identify the structure of the muscle fiber as indicated by the arrow in the image. **Image Description:** The image shows a model of a muscle fiber. A black arrow points to a specific structure within the model. The model uses several colors to represent different sections: - Gray lines are parallel and extend horizontally across the top of the image. - A prominent yellow network covers the model, resembling the sarcoplasmic reticulum. - Red sections are interspersed, likely representing mitochondria or other cellular components. **Options:** - ○ I band - ○ A band - ○ Z disc - ○ H zone **Explanation:** - **I Band:** The light band composed of actin filaments only. - **A Band:** The dark band where actin and myosin filaments overlap. - **Z Disc:** The boundary structure of the sarcomere, where actin filaments are anchored. - **H Zone:** The central part of the A band where only myosin is present, visible during muscle relaxation. Select the correct option based on the indicated structure in the model.
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