Lecture 10: The Heart November 22, 2012
- Beats from conception to death.
- Even when taken out of body it beats until the cells themselves.
- Mitral valve prolapse: mitral valve is not working properly
o Extra risks for infection.
- 3 layers of the heart
o Endocardium (inside), Myocardium, Epicardium (outside)
How the Blood flows in the heart:
- Right atrium receives blood
- 75 times a minute, even in rest
- ECG: spikes show the hearts contractions.
- Hypo = below, hyper = above
- Stroke volume: how efficient your heart is at moving blood.
- CO: product of SV by heart rate.
o “enabling more time” – slide typo
Cardiovascular system: blood cells, heart, blood vessels (arteries, veins and capillaries).
- Difference between veins and arteries.
- Carotid artery takes blood to the brain; jugular vein takes blood from the vein.
CVD: most likely thing that will kill you.
- There’s no margin of error, even a little blockage can cause death to cells because
they’re not receiving blood.
1) Problems that occur due to lack of oxygen (ex. shortness of breath, heart attack
(worst case- portion of the heart dies).
2) Stroke, blockage of blood flow prevents blood to brain.
o Large scale strokes, strong side effects: loss of talking, walking,
depending on what part of the brain has been damaged.
o Micro-strokes: can lead to damage that isn’t obvious (silent stroke) can
lead to slurred speech, cognitive deficits. Stroke goes unnoticed so the
causes of the stroke are never treated.
3) In the legs, pain in calves: swollen legs/calves. Blood and fluid accumulates there
because of blockage.
4) Heart is not pumping efficiently to keep up with the body (shortness of breath-
5) Bacterial inf