Table of contents

Skip topic navigation

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

18. The Heart

Electrocardiogram (ECG)

Anatomy & Physiology

18. The Heart

Electrocardiogram (ECG)

Previous problemNext problem

Struggling with Anatomy & Physiology?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following indicates a normal sinus rhythm?

Heart rate of 60-100 beats per minute with a P wave before each QRS complex

Heart rate of 40-60 beats per minute with irregular P waves

Heart rate of 100-150 beats per minute with absent P waves

Heart rate of 30-40 beats per minute with prolonged PR interval

Previous problemNext problem

Verified step by step guidance

Understand the definition of a normal sinus rhythm: It is a rhythm where the heart rate is between 60-100 beats per minute, and each heartbeat is initiated by a P wave followed by a QRS complex.

Identify the characteristics of each option provided in the problem: Analyze the heart rate and the presence or absence of P waves and QRS complexes.

Option 1: Heart rate of 60-100 beats per minute with a P wave before each QRS complex. This matches the definition of a normal sinus rhythm.

Option 2: Heart rate of 40-60 beats per minute with irregular P waves. This does not match the normal sinus rhythm criteria as the heart rate is below 60 beats per minute and P waves are irregular.

Option 3: Heart rate of 100-150 beats per minute with absent P waves. This does not match the normal sinus rhythm criteria as the heart rate is above 100 beats per minute and P waves are absent.