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

11. Nervous Tissue and Nervous System

Change in Membrane Potential

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Change in Membrane Potential

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Multiple Choice

Heart rate is altered by stimulation of the SA node or the ______.

mitral valve

pulmonary artery

AV node

aortic arch

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Verified step by step guidance

Step 1: Understand the role of the SA node (sinoatrial node) in the heart. It is the natural pacemaker of the heart, responsible for initiating electrical impulses that regulate heart rate.

Step 2: Learn about the AV node (atrioventricular node). It acts as a relay station, receiving impulses from the SA node and transmitting them to the ventricles. Stimulation of the AV node can alter heart rate by affecting the conduction of electrical signals.

Step 3: Eliminate incorrect options. The mitral valve and pulmonary artery are structural components of the heart and circulatory system but do not directly influence heart rate. Similarly, the aortic arch is involved in blood pressure regulation but not in altering heart rate.

Step 4: Recognize that the correct answer is the AV node, as it directly interacts with the SA node to regulate the timing and rhythm of heart contractions.

Step 5: Conclude that stimulation of the AV node can alter heart rate by modifying the transmission of electrical impulses between the atria and ventricles.