Textbook Question
Trace the normal pathway of an electrical impulse through the conducting system of the heart.
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Ch. 20 The Heart
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089
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Table of contents
- Ch. 1 An Introduction to Anatomy and Physiology26
- Ch. 2 The Chemical Level of Organization34
- Ch. 3 The Cellular Level of Organization30
- Ch. 4 The Tissue Level of Organization24
- Ch. 5 The Integumentary System17
- Ch. 6 Bones and Bone Structure36
- 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 Senses16
- Ch. 18 The Endocrine System20
- Ch. 19 Blood31
- Ch. 20 The Heart31
- Ch. 21 Blood Vessels and Circulation29
- Ch. 22 The Lymphatic System and Immunity31
- Ch. 23 The Respiratory System12
- Ch. 24 The Digestive System18
- Ch. 26 The Urinary System31
- Ch. 27 Fluids & Electrolytes32
- Ch. 28 The Reproductive System12
- Ch. 29 Development and Inheritance23
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Not the one you use?Change textbook
Chapter 20, Problem 14
What are the valves in the heart, and what is the function of each?
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Identify the four main valves in the heart: the tricuspid valve, pulmonary valve, mitral (bicuspid) valve, and aortic valve.
Explain that the tricuspid valve is located between the right atrium and right ventricle, and its function is to prevent backflow of blood into the right atrium when the right ventricle contracts.
Describe the pulmonary valve, which is situated between the right ventricle and the pulmonary artery, and its role is to prevent blood from flowing back into the right ventricle after it has been pumped into the pulmonary artery.
Discuss the mitral valve, found between the left atrium and left ventricle, which prevents backflow of blood into the left atrium during left ventricular contraction.
Explain the aortic valve, located between the left ventricle and the aorta, which stops blood from returning to the left ventricle after it has been ejected into the aorta.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Types of Heart Valves
The heart contains four main valves: the tricuspid, pulmonary, mitral, and aortic valves. These valves are located between the heart chambers and major blood vessels, ensuring unidirectional blood flow through the heart.
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Function of Atrioventricular Valves
The tricuspid and mitral valves, known as atrioventricular valves, control blood flow from the atria to the ventricles. They prevent backflow of blood into the atria when the ventricles contract.
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Function of Semilunar Valves
The pulmonary and aortic valves, called semilunar valves, regulate blood flow from the ventricles into the pulmonary artery and aorta. They prevent blood from returning to the ventricles after contraction.
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Related Practice
Textbook Question
What role do the chordae tendineae and papillary muscles play in the normal function of the AV valves?
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Textbook Question
Describe the three distinct layers that make up the heart wall.
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Textbook Question
What three factors regulate stroke volume to ensure that the left and right ventricles pump equal volumes of blood?
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Textbook Question
What is the cardiac cycle? What phases and events are necessary to complete a cardiac cycle?
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Textbook Question
During the cardiac cycle, the amount of blood ejected from the left ventricle when the semilunar valve opens is the:
(a) Stroke volume (SV)
(b) End-diastolic volume (EDV)
(c) End-systolic volume (ESV)
(d) Cardiac output (CO)
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