Pacemaker is located on the posterior right atrium

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pacemaker) is located on the posterior right atrium and generates the impulses for heart contraction. This node initiates impulses that spread throughout the myocardium and is self-exciting (-it does not require a signal from the nervous system).
BIO 202 – Chapter 18
Page 5Impulses from the S-A node quickly spread throughout the atria and cause them to contract. Impulses also spread to the Atrioventricular______________ (A-V) node. The A-V node rapidly sends a signal down the AV_______ bundle and into the interventricular septum. These impulses rapidly spread through purkinje_______ fibers into the walls of the ventricles and causethe ventricles to contract.
ECG/EKG: (7 points)The first wave, the P__________ wave, corresponds to the contraction___________ of the atria.The QRS_______ complex corresponds to the depolarization________ of ventricles and hides the contraction__________________ of atria.
pumped at any one time must adjust to the current needs of the body (more blood needed during strenuous exercise).
Other factors the regulate heart rate:
1 point):
Hormones- How does epinephrine affect heart rate? (1 point):
Drugs-How does caffeine affect heart rate? (1 point):
BIO 202 – Chapter 18
Page 6

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