Cardirespiratory System (Chapter 3) Flashcards
1
Q
system of the body composed of the heart, blood, and blood vessels
A
Cardiovascular system
2
Q
a hollow muscular organ that pumps a circulation of blood through the body by means of rhythmic contraction
A
heart
3
Q
How much does the heart weight?
A
10 ounces
4
Q
the space in the chest between the lungs that contain all the organs of the chest (except the lungs)
A
mediastinum
5
Q
Cardiac muscle is considered a ____ because it cannot be consciously controlled
A
involuntary
6
Q
Typical discharge rate for cardiac muscle is between __ and __ bpm
A
70 & 80
7
Q
Located in the right atrium, this is termed the pacemaker of the heart because it intiitates the heartbeat
A
Sinoatrial (SA) node
8
Q
this delays the impulse before moving on to the ventricles
A
Atrioventricular (AV) node
