Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Problem 4

Textbook Question

Match the following terms with the correct definition.

Z-disc
Sarcomere
A band
H zone
I band
M line

a. The dark band containing the entire length of the thick filament
b. The band of proteins in the middle of the H zone
c. The boundary between sarcomeres
d. The functional unit of contraction
e. The middle region of the A band containing only thick filaments
f. The light band containing only thin filaments

Verified step by step guidance

Step 1: Understand the terms and their roles in muscle anatomy. These terms are related to the structure of a sarcomere, which is the functional unit of a muscle fiber. A sarcomere is composed of repeating units of thick and thin filaments, and the arrangement of these filaments creates distinct bands and zones.

Step 2: Match the term 'Z-disc' with its definition. The Z-disc (or Z-line) is the boundary between sarcomeres, where thin filaments are anchored. This corresponds to definition (c).

Step 3: Match the term 'Sarcomere' with its definition. The sarcomere is the functional unit of contraction in a muscle fiber, as it is the smallest unit capable of contracting. This corresponds to definition (d).

Step 4: Match the term 'A band' with its definition. The A band is the dark band that contains the entire length of the thick filament, including regions where thick and thin filaments overlap. This corresponds to definition (a).

Step 5: Continue matching the remaining terms: 'H zone' is the middle region of the A band containing only thick filaments (e), 'I band' is the light band containing only thin filaments (f), and 'M line' is the band of proteins in the middle of the H zone (b).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Z-disc

The Z-disc, or Z-line, is a structural component of a sarcomere, which serves as the boundary between adjacent sarcomeres in a muscle fiber. It anchors the thin filaments (actin) and plays a crucial role in the contraction process by maintaining the alignment of the sarcomere during muscle contraction and relaxation.

Sarcomere

The sarcomere is the fundamental unit of muscle contraction, defined as the segment between two Z-discs. It contains overlapping thick (myosin) and thin (actin) filaments, and its contraction is responsible for the shortening of muscle fibers, enabling movement. Understanding the structure of the sarcomere is essential for grasping how muscles function.

A band

The A band is the dark region of the sarcomere that contains the entire length of the thick filaments (myosin) and overlaps with the thin filaments (actin). This band is crucial for muscle contraction, as it represents the area where the force is generated during the sliding filament mechanism. The A band remains constant in length during contraction, while the I band and H zone change.