Textbook Question
Compare the effects of the cardioacceleratory and cardioinhibitory centers on cardiac output and blood pressure.
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Ch. 21 Blood Vessels and Circulation
Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology25
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization29
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure33
- Ch. 7 The Axial Skeleton11
- Ch. 8 The Appendicular Skeleton17
- Ch. 9 Joints13
- Ch. 10 Muscle Tissue12
- Ch. 11 The Muscular System28
- Ch. 12 Nervous Tissue18
- Ch. 13 The Spinal Cord, Spinal Nerves, and Spinal Reflexes22
- Ch. 14 The Brain and Cranial Nerves20
- Ch. 15 Sensory Pathways and the Somatic Nervous System17
- Ch. 16 The Autonomic Nervous System and Higher-Order Functions30
- Ch. 17 The Special Senses15
- Ch. 18 The Endocrine System21
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation26
- Ch. 22 The Lymphatic System and Immunity25
- Ch. 23 The Respiratory System4
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes30
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance17
Martini, Nath, Bartholomew12th EditionFundamentals of Anatomy and PhysiologyISBN: 9780137854011Not the one you use?Change textbook
Chapter 21, Problem 25
How do pressure and resistance affect cardiac output and peripheral blood flow?
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Understand the relationship between cardiac output (CO), blood pressure (P), and resistance (R) using the fundamental hemodynamic equation: \(CO = \frac{P}{R}\). This means cardiac output is directly proportional to pressure and inversely proportional to resistance.
Recognize that pressure in this context refers to the difference in blood pressure between the arterial and venous systems, which drives blood flow through the circulatory system.
Identify that resistance primarily comes from the diameter of blood vessels, blood viscosity, and vessel length, with vessel diameter being the most significant factor affecting resistance.
Analyze how an increase in resistance (for example, due to vasoconstriction) will decrease cardiac output if pressure remains constant, thereby reducing peripheral blood flow.
Consider how changes in pressure (such as increased arterial pressure) can increase cardiac output and peripheral blood flow if resistance remains unchanged, highlighting the dynamic balance between these factors in regulating circulation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cardiac Output
Cardiac output is the volume of blood the heart pumps per minute, calculated as heart rate multiplied by stroke volume. It determines how much blood is delivered to tissues and is influenced by factors like preload, afterload, and contractility.
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Events in the Cardiac Cycle
Vascular Resistance
Vascular resistance refers to the opposition blood faces when flowing through blood vessels, primarily determined by vessel diameter and blood viscosity. Higher resistance reduces blood flow and increases the workload on the heart.
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Relationship Between Pressure, Resistance, and Blood Flow
Blood flow is driven by the pressure gradient between arteries and veins and is inversely related to resistance, as described by Poiseuille’s law. Increased resistance or decreased pressure reduces flow, affecting tissue perfusion and cardiac workload.
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Related Practice
Textbook Question
Which of the following is greater?
(a) The osmotic pressure of the interstitial fluid during inflammation
(b) The osmotic pressure of the interstitial fluid during normal conditions
(c) Neither is greater
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Textbook Question
Why is blood flow to the brain relatively continuous and constant?
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Textbook Question
How is blood pressure maintained in veins to counter the force of gravity?
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Textbook Question
Bob is sitting outside on a warm day and is sweating profusely. Mary wants to practice taking blood pressures, and he agrees to play the patient. Mary finds that Bob's blood pressure is elevated, even though he is resting and has lost fluid from sweating. (She reasons that fluid loss should lower blood volume and, thus, blood pressure.) Why is Bob's blood pressure high instead of low?
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Textbook Question
Why do capillaries permit the diffusion of materials, whereas arteries and veins do not?
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