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

18. The Heart

Electrical Conduction System of the Heart

Anatomy & Physiology

18. The Heart

Electrical Conduction System of the Heart

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Problem 1e

Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The heart plays a role in the regulation of blood pressure and secretes the hormone atrial natriuretic peptide.

Verified step by step guidance

Step 1: Understand the role of the heart in regulating blood pressure. The heart contributes to blood pressure regulation by adjusting cardiac output (the amount of blood pumped by the heart per minute) and by secreting hormones that influence vascular resistance and fluid balance.

Step 2: Learn about atrial natriuretic peptide (ANP). ANP is a hormone secreted by the atria of the heart in response to increased blood volume or pressure. It helps reduce blood pressure by promoting sodium and water excretion by the kidneys, dilating blood vessels, and inhibiting the release of other hormones like aldosterone.

Step 3: Evaluate the statement 'The heart plays a role in the regulation of blood pressure and secretes the hormone atrial natriuretic peptide.' Based on the information above, this statement is true because the heart does regulate blood pressure and secretes ANP.

Step 4: If the statement were false, you would need to correct it. For example, if the statement incorrectly claimed that the heart does not regulate blood pressure or does not secrete ANP, you would correct it by stating that the heart does regulate blood pressure and secretes ANP.

Step 5: Confirm the accuracy of the statement by reviewing relevant Anatomy & Physiology concepts, such as the role of the heart in homeostasis and the function of ANP in blood pressure regulation.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Heart Function

The heart is a muscular organ responsible for pumping blood throughout the body. It plays a crucial role in maintaining blood circulation, which is essential for delivering oxygen and nutrients to tissues and organs. Additionally, the heart's rhythmic contractions help regulate blood pressure by adjusting the volume of blood ejected with each heartbeat.

Atrial Natriuretic Peptide (ANP)

Atrial natriuretic peptide (ANP) is a hormone secreted by the heart's atria in response to increased blood volume and pressure. ANP functions to lower blood pressure by promoting vasodilation and increasing the excretion of sodium and water by the kidneys. This hormone plays a significant role in fluid balance and cardiovascular homeostasis.

Blood Pressure Regulation

Blood pressure regulation involves various physiological mechanisms that maintain optimal blood flow and pressure within the circulatory system. Key factors include cardiac output, vascular resistance, and blood volume. The heart, blood vessels, and hormones like ANP work together to ensure that blood pressure remains within a healthy range, adapting to the body's needs during different activities.

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Textbook Question

The portion of the intrinsic conduction system located in the superior interventricular septum is the:

a. AV node

b. SA node

c. AV bundle

d. Subendocardial conducting network

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Textbook Question

More than one choice may apply.

Using the figure, identify the most external part of the pericardium.

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Textbook Question

Draw a diagram of the heart showing the three layers composing its wall and its four chambers. Label each. Show where the AV and semilunar valves are, and name them. Show and label all blood vessels entering and leaving the heart chambers.

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Textbook Question

Name three different factors that increase heart rate.

The ______ is the primary pacemaker of the heart.

a. Atrioventricular node

b. sinoatrial node

c. Purkinje fiber system

d. Atrioventricular bundle

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Textbook Question

The AV node delay:

a. Allows the atria and ventricles to depolarize and contract as a unit.

b. Allows the two ventricles to depolarize and contract separately.

c. Allows the atria and ventricles to depolarize and contract separately.

d. Speeds up the impulse transmission from the atria to the ventricles.

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Textbook Question

A newer drug, ivabradine, lowers the heart rate by blocking the nonselective HCN cation channels. Why would this action decrease the heart rate? Would this drug have an effect on pacemaker cells, contractile cells, or both? Explain.

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Multiple Choice

Which of the following arrhythmias can synchronized cardioversion be used to treat?

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