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1. Introduction to Anatomy & Physiology5h 40m
2. Cell Chemistry & Cell Components12h 37m
3. Energy & Cell Processes10h 7m
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 Blood1h 22m
18. The Heart1h 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 BalanceComing soon
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. HeredityComing soon

18. The Heart

Cardiac Action Potentials

Anatomy & Physiology18. The HeartCardiac Action Potentials

Multiple Choice

Multiple Choice

The absolute refractory period refers to the time during which __________.

A

the muscle cell will not respond to a stimulus of any strength

B

the muscle cell will respond only to an exceptionally strong stimulus

C

the muscle cell is ready to respond to any stimulus

D

the muscle cell will respond only to a sub-threshold stimulus

E

the muscle cell is ready to respond to a threshold stimulus

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