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

Axons insulated by a(n) _____ are able to conduct impulses faster than those not so insulated.

dendrite

axon terminal

cell body

myelin sheath

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Verified step by step guidance

Step 1: Understand the structure of a neuron. A neuron consists of several parts: dendrites (which receive signals), the cell body (which contains the nucleus), the axon (which transmits signals), and axon terminals (which release neurotransmitters).

Step 2: Learn about the function of the myelin sheath. The myelin sheath is a fatty layer that wraps around the axon of certain neurons. It acts as an insulator and helps speed up the transmission of electrical impulses.

Step 3: Compare the conduction speed of myelinated versus unmyelinated axons. Myelinated axons conduct impulses faster due to a process called saltatory conduction, where the electrical signal 'jumps' between nodes of Ranvier (gaps in the myelin sheath). Unmyelinated axons conduct impulses more slowly because the signal travels continuously along the axon.

Step 4: Eliminate incorrect options. Dendrites, axon terminals, and the cell body are not involved in insulating the axon or speeding up impulse conduction. The correct answer is the myelin sheath.

Step 5: Conclude that axons insulated by a myelin sheath are able to conduct impulses faster than those not insulated, due to the efficiency of saltatory conduction.