Exam 3: Circulatory System 2: The Heart Flashcards
1
Q
Size and Shape of Heart
A
- essentially a muscular “pump”
- normal heart is about the size of your clenched fist
- enlarged hearts are sick hearts
- located behind sternum and left ribs
- enclosed in pericardium
2
Q
Endocardium
A
- endothelium covering a CT layer
- lines the inside of the heart & covers its valves
3
Q
Myocardium
A
- cardiac muscle
- thickest layer
4
Q
Epicardium (Visceral layer of Serous Pericardium)
A
-thin serous membrane and some fat
5
Q
Pericardium
A
-made up of fibrous pericardium and serous pericardium and pericardial cavity
6
Q
Fibrous Pericardium
A
- outermost layer
- dense CT
- functions: prevents heart from overfilling with blood
- restricts heart movements
7
Q
Serous Pericardium
A
- serous membrane that secretes serous fluid for lubrication
- parietal layer-adheres to fibrous pericardium
- visceral layer-adheres to heart wall (same as epicardium)
8
Q
Pericardial Cavity
A
- space between visceral and parietal layers
- serous fluid secreted in here
9
Q
Right Atrium
A
- receives venous (deoxgenated) blood from superior and inverior venae cavae
- blood will flow from right atrium to right ventricle through the right atrioventricular (tricuspid) valve
10
Q
Right Ventricle
A
- receives blood from right atrium
- 3 papillary muscles-conical muscle bulges
- chordae tendineae
- blood runs from right ventricle through pulmonary semilunar valve and into pulmonary trunk
11
Q
Chordae Tendineae
A
- from papillary muscles to 3 flaps of right AV valve
- function: prevent R AV valve from turning inside out (everting/prolapsing) into R atrium when the ventricles contract
12
Q
Pulmonary Semilunar Valve
A
- 3 semilunar cusps
- prevents backflow into R ventricle
- blood will now travel into pulmonary arteries to lungs
13
Q
Left Atrium
A
- receives oxygenated blood form lungs via 3 or 4 pulmonary veins
- blood will flow from left atrium to left ventricle via the left atrioventricular (mitral/bicuspid) valve
14
Q
Left Ventricle
A
- pumps oxygenated blood into aorta
- papillary muscles and chordae tendineae
- blood is pushed from left ventricle through aortic semilunar valve
15
Q
Pulmonary Trunk and Pulmonary Arteries
A
-blood is deoxygenated here