the heart Flashcards
1
Q
- Which wall of the heart is thickest and why?
A
- myocardium in the left ventricle
- it needs to be able to push blood out of the heart and into the rest of the body through the systemic pump
2
Q
- What part of the heart is the pacemaker and why?
A
- SA node (sinus)
- creates electrical impulses that monitor heart rate
3
Q
- Where is the SA node located?
A
right atrium
4
Q
systolic
A
- number on top of the blood pressure
- the amount of pressure on the atrias during systole
5
Q
diostolic
A
- the bottom number
- pressure during diastole
6
Q
- List the path of blood through the heart. Which side is oxygenated and deoxygenated?
A
- inferior and superior vena cava
- right atrium
- tricuspid
- right ventricle
- pulmonary valve
- pulmonary trunk
- pulmonary artery
- lungs/ capillary beds
- pulmonary viens
- left atrium
- mitral valve
- left ventrical
- aortic valve
- aortic arch
- aortic artery
- systemic artery
7
Q
- Explain what is happening when the A/V valves are closing?
A
- the atria are emptying
- “lub”
- ventricles are filling
- semilunar valves are opening
8
Q
- Explain what is happening When the semi lunar valves are closing?
A
- the atria are filling with blood
- ventricles are contracting’
- av valves are closing
- “dub”
9
Q
- What is the term for the lack of oxygen to the body
A
-hypoxia
10
Q
- How is the lumen different in the arteries and veins
A
- arteries have high pressure so walls are thicker
- arteries have a smaller lumen
- veins have less pressure so lumen is larger and muscle is thinner
11
Q
- What is the structure for the layers of the heart wall?
A
epicardium
myocardium
endocardium
12
Q
define chordae tendineae. Function?
A
- fiborous strands that attach valves to the heart
- pulls the AV valves shut to create the lub sound
13
Q
- What are the functions of the valves of the heart?
A
-prevent back flow
14
Q
- What is the difference between the apex and base?
A
- apex is where the structure comes to a point
- left ventricle
15
Q
- Heart: Where is it? Between? Size? Lies on?
A
- center of your chest but tilted a little to the left side
- size of a human fist
- lies on the diaphragm (thin sheet of muscle)