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Ch. 17 - Cardiovascular Physiology I: The HeartWorksheetSee all chapters
All Chapters
Ch. 1 - Introduction to Physiology
Ch. 2 - Molecules and Molecular Interactions
Ch. 3 - Cells and Tissues
Ch. 4 - Cell Metabolism: Bioenergetics, Enzymes, and Respiration
Ch. 5 - Membrane Dynamics
Ch. 6 - Cell Communication
Ch. 7 - Integumentary System
Ch. 8 - Bone and Cartilage
Ch. 9 - Skeletal System
Ch. 10 - Joints
Ch. 11 - Muscles
Ch. 12 - The Nervous System I: Neurons and Neuronal Networks
Ch. 13 - The Nervous System II: The Central Nervous System
Ch. 14 - The Autonomic Nervous System
Ch. 15 - Sensory Physiology
Ch. 16 - The Endocrine System
Ch. 17 - Cardiovascular Physiology I: The Heart
Ch. 18 - Cardiovascular Physiology II: Blood, Blood Vessels, Circulation, and Exchange
Ch. 19 - The Urinary System
Ch. 20 - Respiratory Physiology
Ch. 21 - Acid-Base Balance-- Controlling Blood pH
Ch. 22 - Introduction to the Immune System
Ch. 23 The Lymphatic System
Ch. 23 - The Digestive System
Ch. 24 - Regulation of Metabolism and Energy Balance
Ch. 25 - Human Sexual Reproduction and Development

Concept #1: LV Volumes--End-Systolic, End-Diastolic, Stroke Volumes

Practice: Exercise increases the amount of blood that returns to the heart between beats. Which of the following is directly changed by exercise-mediated increases in venous return?

Practice: Epinephrine is a hormone that binds to β1 adrenergic receptors on cardiac contractile fibers. The activation of β1 adrenergic receptors causes an increase in the “contractility” of cardiac contractile fibers—the fibers contract more forcefully. As a result, the heart ejects more blood per beat and leaves less “leftover.” Which of the following is directly changed by epinephrine-mediated increases in cardiac contractility?