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

16. The Endocrine System

Introduction to the Endocrine System

Anatomy & Physiology

16. The Endocrine System

Introduction to the Endocrine System

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 events occurs immediately after the P wave in the cardiac cycle?

Atrial contraction

Ventricular relaxation

Ventricular contraction

Atrial relaxation

Previous problemNext problem

Verified step by step guidance

Understand the cardiac cycle: The cardiac cycle consists of a series of events that occur as the heart beats, including electrical activity, muscle contraction, and relaxation.

Identify the P wave: The P wave is the first wave in the electrocardiogram (ECG) and represents the electrical activity associated with the depolarization of the atria.

Recognize the sequence of events: Immediately after the P wave, the atria contract to push blood into the ventricles. This is known as atrial contraction.

Differentiate between atrial and ventricular events: Atrial contraction occurs before ventricular contraction. Ventricular contraction is represented by the QRS complex in the ECG.

Conclude the sequence: After atrial contraction, the ventricles will eventually contract, but this occurs after the QRS complex, not immediately after the P wave.