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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Each segment of an annelid contains which of the following structures?

A complete set of organs

A single heart

A single nerve cord

A pair of lungs

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Verified step by step guidance

Understand the anatomy of annelids: Annelids are segmented worms, and each segment is known as a 'metamere' or 'somite'. These segments are repeated along the length of the body.

Identify the key features of annelid segments: Each segment typically contains a complete set of organs, which includes structures such as nephridia (for excretion), muscles, and sometimes reproductive organs.

Consider the circulatory system: Annelids have a closed circulatory system, and while they do have multiple hearts, these are not confined to a single segment. Instead, they are distributed along the body.

Examine the nervous system: Annelids possess a ventral nerve cord that runs the length of the body, with ganglia in each segment, but not a single nerve cord per segment.

Evaluate respiratory structures: Annelids do not have lungs; they typically respire through their skin or gills, depending on the species. Therefore, a pair of lungs is not present in each segment.