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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Multiple Choice

Against which of the following do the circular and longitudinal muscles of annelids work?

Cartilaginous structure

Endoskeleton

Hydrostatic skeleton

Exoskeleton

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Verified step by step guidance

Understand the function of circular and longitudinal muscles in annelids. These muscles are responsible for movement and locomotion.

Recognize that annelids, such as earthworms, do not have a rigid skeleton like an endoskeleton or exoskeleton. Instead, they rely on a hydrostatic skeleton.

A hydrostatic skeleton is a structure found in many soft-bodied animals, consisting of a fluid-filled cavity surrounded by muscles. The fluid provides support and shape.

The circular muscles contract to make the body segment thinner and longer, while the longitudinal muscles contract to make the segment shorter and thicker. This interaction allows the annelid to move efficiently.

Identify that the hydrostatic skeleton allows annelids to change shape and move by coordinating the contraction and relaxation of these muscles, providing a flexible and adaptable form of support.