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Memmler’s The Human Body in Health and Disease 11 th edition. Chapter 14 The Heart and Heart Disease. Circulation and the Heart. Circulation Continuous one-way circuit of the blood vessels Propelled by heart. Location of the Heart. Between the lungs Left of the midline of the body
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The Heart and Heart Disease
Three tissue layers
The sac that encloses the heart
• Which layer of the heart wall is the thickest?
Checkpoint 14-2:What is the name of the sac that encloses the heart?
• What vessel carries blood into the systemic circuit?
• Which heart chamber has the thickest wall?
Question: Which chamber of the heart receives oxygenated blood coming in from the lungs in the pulmonary veins?a. right atriumb. left ventriclec. left atrium
Blood from the systemic circuit enters the right atrium (1) through the superior and inferior venae cavae, flows through the right AV (tricuspid) valve (2), and enters the right ventricle (3). The right ventricle pumps the blood through the pulmonary (semilunar) valve (4) into the pulmonary trunk, which divides to carry blood to the lungs in the pulmonary circuit.
Blood returns from the lungs in the pulmonary veins, enters the left atrium (5), and flows through the left AV (mitral) valve (6) into the left ventricle (7). The left ventricle pumps the blood through the aortic (semilunar) valve (8) into the aorta, which carries blood into the systemic circuit.
Left and right sides of heart work together in cardiac cycle (heartbeat)
ZOOMING IN • When the ventricles contract, what valves close? What valves open?
Calculating cardiac output
Checkpoint 14-7: Cardiac output is the amount of blood pumped by each ventricle in 1 minute. What two factors determine cardiac output?
Electrical energy stimulates heart muscle
• What parts of the conduction system do the internodal pathways connect?
Influences that allow heart to meet changing needs rapidly
Checkpoint 14-10:What is a heart murmur?
Most common cause of death in industrialized countries is heart and circulatory system disease
Congenital heart disease often results from fetal development defects
Coronary arteries can degenerate
Question:What is the name of the fatty substance that builds up inside the vessel walls in atherosclerosis?a. plaqueb. lumenc. thrombus
Heart is unable to pump sufficient blood
How the heart can age
Question:The technique to restore normal heartbeat by either electric shock or drugs is known as:a. defibrillationb. cardioversionc. ablation