week 10- heart Flashcards
Purpose of right side of heart
pushes blood into lungs
purpose of left side of heart
pushes blood to body
Where will blood back up if right side fails?
back up in body, lead too peripheral edema
Where will blood back up if left side fails?
blood backs up in the lungs
autorhythmic
it does not
require nervous system stimulation to beat
because it generates its own electrical signals
(action potentials) to generate a heart beat
“conduction system” of the heart?
coordinates the heartbeat
-composed of an internal pacemaker and nervelike
conduction pathways through myocardium
How does the heart actually pump?
both Atriums contract and send blood to ventricles, then both ventricles send it through body
Describe what is occurring in atria
and ventricles during the cardiac cycle.
RA- receives blood from S/I VC
LA-receives blood from pulmonary veins
RV-receives blood from RA through AV valve-semds to pulmonary trunk
LV-receives blood from LA through bicuspid valve - sends out aorta
purpose of the heart valves
prevent backwards flow of blood
Atrioventricular valve
tricuspid and bicuspid valves
semilunar valve
-aortic and pulmonary valves
-Allow blood to exit ventricles and enter aorta
or pulmonary trunk
cardiac tissue
only found in heart
Coronary circulation
Provides cardiac muscle cells with reliable supplies
of oxygen and nutrients
3 layers of heart wall
Epicardium
myocardium
endocardium
Epicardium
Covers surface of heart—outermost layer
Myocardium
responsible for the pumping action of the heart?
endocardium
Covering inner surfaces of heart
pericardium
fibrous sac that encloses/surrounds the
heart and the great vessels
coronary arteries
2 main arteries branch extensively
2 main
coronary arteries?
Right and left
What happens if a coronary artery is partially vs completely blocked?
P-pain in chest
C-heart attack
sinoatrial (SA) node
initiates each heartbeat and determines heart rate
atrioventricular (AV) node
electrical gateway to the ventricles
pulmonary circuit
carries blood from right side to lungs for gas
exchange and back to heart
systemic circuit
blood that flows from heart to body
back to heart)
systolic pressure
ventricular contraction
diastolic pressure
ventricular relaxation
s1 and s2
1-lubb
2-dupp
Blood pressure
-generated by the left ventricle
-the force that blood exerts against a vessel wall
Order of structures on path of a red blood cell
Superior/inferior Vena cavae
right atrium
tricuspid valve
right ventricle
pulmonary valve
pulmonary trunk
pulmonary arteries
lungs
pulmonary veins
left atrium
bicuspid valve
left ventricle
aortic valve
aorta
Right atrium
1
Left atrium
2
Right ventricle
3
Left ventricle
4
Interventriclular septum
5
Aortic valve
6
Pulmonary valve
7
Bicuspid valve
8
tricuspid valve
9
Chordae tendinae
10
papillary muscles
11
inferior vena cava
12
Superior vena cava
13
Aortic arch
14
Braciocephalic trunk
15
left common carotid art
16
left subclavian art
17
Pulmonary artery
18
Pulmonary vein
19
Pulmonary trunk
20
Left coronary artery
21
Anterior interventrivular artery
22
Right coronary artery
23
Common cartoid art
24
Internal carotid art
25
external carotid art
26
Vertebral artery
27
Brachiocephalic vein
28
internal jugular vein
29
external jugular vein
30
thoracic aorta
31
abdominal aorta
32
inferior vena cava torso
33
