Textbook Question
The sequence of contraction of the heart chambers is:
a. Random
b. Left chambers followed by right chambers
c. Both atria followed by both ventricles
d. Right atrium, right ventricle, left atrium, left ventricle
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Ch. 18 The Cardiovascular System: The Heart
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
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Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
Chapter 18, Problem 6
The chordae tendineae:
a. The atrioventricular valves
b. Prevent the AV valve flaps from everting
c. Contract the papillary muscles
d. Open the semilunar valves
Verified step by step guidance1
Understand the anatomy of the heart: The chordae tendineae are fibrous cords that connect the atrioventricular (AV) valve flaps to the papillary muscles located in the ventricles.
Learn the function of the chordae tendineae: Their primary role is to prevent the AV valve flaps (tricuspid and mitral valves) from everting or flipping backward into the atria during ventricular contraction.
Clarify the role of papillary muscles: The papillary muscles contract during ventricular systole, pulling on the chordae tendineae to maintain tension and ensure the AV valves remain closed properly.
Differentiate between AV valves and semilunar valves: The chordae tendineae are associated only with the AV valves (tricuspid and mitral) and do not play a role in opening or closing the semilunar valves (pulmonary and aortic valves).
Review the options provided: Based on the anatomy and function of the chordae tendineae, identify the correct answer as the one describing their role in preventing the AV valve flaps from everting.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chordae Tendineae
The chordae tendineae are fibrous cords that connect the papillary muscles to the atrioventricular (AV) valves in the heart. They play a crucial role in maintaining the position of the valve flaps during the cardiac cycle, preventing them from inverting or prolapsing into the atria when the ventricles contract.
Atrioventricular Valves
The atrioventricular valves, which include the tricuspid and mitral valves, are located between the atria and ventricles of the heart. They ensure unidirectional blood flow from the atria to the ventricles and are supported by the chordae tendineae and papillary muscles to prevent backflow during ventricular contraction.
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7:13
Systole, Diastole, Pressure, & Valves
Papillary Muscles
Papillary muscles are small muscular projections located within the ventricles of the heart. They are attached to the chordae tendineae and contract during ventricular systole, helping to stabilize the AV valves and prevent them from inverting, thus ensuring proper closure and function of the valves.
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Related Practice
Textbook Question
Freshly oxygenated blood is first received by the:
a. Right atrium
b. Left atrium
c. Right ventricle
d. Left ventricle
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Textbook Question
Describe the location and position of the heart in the body.
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Textbook Question
The fact that the left ventricular wall is thicker than the right reveals that it:
a. Pumps a greater volume of blood
b. Pumps blood against greater resistance
c. Expands the thoracic cage
d. Pumps blood through a smaller valve
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Textbook Question
In the heart, which of the following apply?
(1) Action potentials are conducted from cell to cell across the myocardium via gap junctions
(2) The SA node sets the pace for the heart as a whole
(3) Spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation
(4) Cardiac muscle can continue to contract for long periods in the absence of oxygen
a. All of the above
b. 1, 3, 4
c. 1, 2, 3
d. 2, 3
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Textbook Question
An ECG provides information about:
a. Cardiac output
b. Movement of the excitation wave across the heart
c. Coronary circulation
d. Valve impairment
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