The (a)   circuit supplies the entire body and serves to exchange O2 for CO2. It supplies organs with nutrients, hormones, etc.

What is a word for when all four chambers are RELAXED?

(a)  

What is a word for when things in the heart CONTRACT?

(a)  

the heart (a)   consists of plate and fibrous tissue between atria and ventricles. Provides support, electrical insulation, and site for muscle attatchment.

What is small cluster of specialized cells in the right atrium that initiate electrical impulses to regulate the heart's rhythm, it sets the pace of the heartbeat?

(a)  

What is a cluster of specialized heart cells that delays electrical impulses from the sinoatrial (SA) node, allowing the atria to contract before passing the signal to the ventricles for coordinated contraction?

(a)  

Cardiac rhythm:

What goes with bundle branch block, atrial flutter, premature ventricular contraction (PVCS), ventricular fibrillation etc.

(a)  

Cardiac rhythm:

What is produced by the AV node, 40-50 bpm

Other ectopic foci can produce 20-40 bpm

(a)  

Cardiac rhythm:

What goes with 70-80 bpm at rest and driven by the SA node?

(a)  

Pacemaker potential:

In the SA node there is a leaky (a)   channel

Pacemaker potential:

2. After the sodium comes in slowly, membrane potential is reached and sodium and (a)   inflow rapidly

Pacemaker potential of SA node:

2. The depolarization caused by the inflow of Na+ and Ca2+ causes a fast outflow of (a)  

Response of Myocardium:

1. 1. Voltage gated (a)   channels open

Response of Myocardium:

1. 4. (a)   channels open, causing an inflow that prolongs the depolarization, producing the plateau

Response of Myocardium:

1. 5. Ca2+ channels close, Ca2+ is pumped out; (a)   channels open causing an outflow that returns the voltage to RMP