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

At which point in the cardiac cycle does pressure begin to rise in the aorta?

At the end of atrial systole

During ventricular ejection

During ventricular diastole

At the onset of ventricular systole

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Verified step by step guidance

Understand the cardiac cycle: The cardiac cycle consists of atrial systole, ventricular systole, and diastole. Each phase corresponds to specific pressure changes in the heart chambers and major arteries like the aorta.

Focus on ventricular systole: Ventricular systole is the phase where the ventricles contract, forcing blood into the aorta and pulmonary arteries. This contraction increases pressure in the ventricles and subsequently in the aorta.

Identify ventricular ejection: During ventricular systole, the ventricular pressure surpasses the pressure in the aorta, causing the aortic valve to open. Blood is ejected into the aorta, leading to a rise in aortic pressure. This specific part of ventricular systole is called ventricular ejection.

Eliminate other options: Atrial systole occurs before ventricular systole and primarily increases pressure in the atria, not the aorta. Ventricular diastole is the relaxation phase, during which pressure in the aorta decreases as blood flows away from the heart. The onset of ventricular systole marks the beginning of contraction but does not yet involve ejection of blood into the aorta.

Conclude: The pressure in the aorta begins to rise during ventricular ejection, as this is the phase when blood is actively pushed into the aorta, increasing its pressure.