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

Anatomical Terms for the Arm and Hand

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Anatomical Terms for the Arm and Hand

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Multiple Choice

When a needle is inserted into the forearm, which sequence correctly represents the order in which the epidermal layers are pierced, from superficial to deep?

Stratum granulosum, stratum corneum, stratum spinosum, stratum basale

Stratum spinosum, stratum corneum, stratum granulosum, stratum basale

Stratum basale, stratum spinosum, stratum granulosum, stratum corneum

Stratum corneum, stratum granulosum, stratum spinosum, stratum basale

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Verified step by step guidance

Step 1: Begin by understanding the structure of the epidermis, which is the outermost layer of the skin. The epidermis is composed of several layers arranged from superficial (outermost) to deep (innermost). These layers are: stratum corneum, stratum granulosum, stratum spinosum, and stratum basale.

Step 2: Recall the function and characteristics of each layer. The stratum corneum is the outermost layer, consisting of dead, keratinized cells that provide a protective barrier. The stratum granulosum contains cells that are undergoing keratinization. The stratum spinosum is composed of living keratinocytes connected by desmosomes, and the stratum basale is the deepest layer, where cell division occurs to replenish the epidermis.

Step 3: When a needle is inserted into the forearm, it pierces the epidermal layers in order from superficial to deep. This means the needle first penetrates the stratum corneum, followed by the stratum granulosum, then the stratum spinosum, and finally the stratum basale.

Step 4: Compare the given sequences in the problem to identify the correct order. The correct sequence is: Stratum corneum, stratum granulosum, stratum spinosum, stratum basale.

Step 5: Understand why the other sequences are incorrect. For example, the sequence 'Stratum granulosum, stratum corneum, stratum spinosum, stratum basale' is incorrect because the stratum corneum is the outermost layer and must be pierced first. Similarly, the sequence 'Stratum spinosum, stratum corneum, stratum granulosum, stratum basale' is incorrect because the stratum spinosum is deeper than the stratum corneum and stratum granulosum.