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