Ch. 17 - Cardiovascular Physiology I: The HeartSee 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: EKG Waveforms-- P Wave, QRS Complex, T Wave

Concept #2: EKG Intervals and Segments

Concept #3: Relationship Between EKG and Cardiac APs

Concept #4: EKGs, Heart Rate, and Rhythm

Concept #5: Arrhythmias-- AV Blocks

Concept #6: The 12-Lead EKG

Practice: Mitral stenosis is a cardiac disease that can cause the atria to hypertrophy—develop more muscle and get bigger. This hypertrophy changes the way that the atria depolarize. Which of the following phases of the EKG is likely to be affected by atrial hypertrophy secondary to mitral stenosis?

Practice: One of epinephrine’s effects on the heart is to speed up AV Node conduction—in the presence of epinephrine it takes less time for depolarization to spread from the atria to the ventricles. Which of the following parts of the EKG will be directly affected by this increase in AV Node conduction speed?

Practice: Which of the following parts of the EKG most closely corresponds to the time during which ventricular fibers are in the Ca2+ plateaus (i.e. Phase 2) in their action potentials?

Practice: A 15-year-old male receives his first kiss during the passing period between AP Biology and AP World History. Before the kiss, his heart rate was 66 beats/minute. After the kiss, his heart rate is 130 beats/minute. Which of the following describes his current heart rhythm?

Practice: Refer to the Lead II electrocardiogram recording below for practice problems 5-6. 

Which of the following is the rhythm shown in the EKG above? 

Practice: Which of the following are acting as the pacemaking fibers for the atria?