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Which of the following letters is identifying the H zone? О А Ов Ос D О Е A В с

Which of the following letters is identifying the H zone? О А Ов Ос D О Е A В с

Human Anatomy & Physiology (11th Edition)
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
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Question:** Which of the following letters is identifying the H zone? **Diagram Explanation:** The image shows a detailed diagram of a sarcomere, which is the basic unit of a muscle's contractile structure. The sarcomere is depicted as a cylindrical structure with different regions marked by letters (A, B, C, D, and E). - **A** and **D:** Indicate the Z lines, appearing at the boundaries of the sarcomere. - **B:** Indicates the I band, which is the lighter region due to the absence of thick filaments. - **C:** Indicates the A band, which includes the entire length of the thick filament, overlapping with thin filaments. - **E:** Brackets a section that is likely meant to represent the length of one full sarcomere. The **H zone** (letter C) is identified within the A band, where only thick filaments are present, and no overlap with thin filaments occurs. **Answer Choices:** - ○ A - ○ B - ○ C - ○ D - ○ E
Transcribed Image Text:**Question:** Which of the following letters is identifying the H zone? **Diagram Explanation:** The image shows a detailed diagram of a sarcomere, which is the basic unit of a muscle's contractile structure. The sarcomere is depicted as a cylindrical structure with different regions marked by letters (A, B, C, D, and E). - **A** and **D:** Indicate the Z lines, appearing at the boundaries of the sarcomere. - **B:** Indicates the I band, which is the lighter region due to the absence of thick filaments. - **C:** Indicates the A band, which includes the entire length of the thick filament, overlapping with thin filaments. - **E:** Brackets a section that is likely meant to represent the length of one full sarcomere. The **H zone** (letter C) is identified within the A band, where only thick filaments are present, and no overlap with thin filaments occurs. **Answer Choices:** - ○ A - ○ B - ○ C - ○ D - ○ E
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The contractile unit of muscles is known as sarcomere that shows presence of contractile proteins actin and myosin. Sarcomeres are separated by thin, comparatively dense zigzag line or disc called Z-line or Z-disc. The bulk of fibre is arranged in the form of myofibrils that have characteristics striations due to the precise organisation of the contractile proteins actin and myosin.

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