chapter 20 hw
The following are structural components of the conducting system of the heart. 1. Purkinje fibers 2. AV bundle 3. AV node 4. SA node 5. bundle branches. The sequence in which excitation would move through this system is
4, 3, 2, 5, 1.
________ is to slow heart rate as ________ is to fast heart rate.
Bradycardia; tachycardia
The first blood vessels to branch from the aorta are the ________ arteries.
coronary
When a blood clot forms on a ruptured plaque in a coronary artery, the condition is referred to as a(n)
coronary thrombosis
The visceral pericardium is the same as the
epicardium
________ is when the heart can't maintain adequate cardiac output.
heart failure
Blood returning to the heart from the pulmonary circuit first enters the
left atrium
Which chamber has the thickest wall?
left ventricle
How is heart rate controlled?
Through the cardiac plexus, Parasympathetic and sympathetic divisions of the ANS, and Dual innervation
The muscle layer of the heart is the
myocardium
Into which chamber of the heart will blood flow next after the coronary sinus
right atrium
The normal pacemaker of the heart is located in
sinoatrial node