Health Sciences 2300A/B Lecture 21: The Heart Part 1 Mar 28
28 Mar 2017
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Kin 2222b lecture 21 mar 28 2017. Materials taught today will be included in bell ringer, not vessels part on thursday. How exercise, diseases, amazing organ, engine of the body. Remove the heart away, input o2 can beat for days. Ca(cid:374) (cid:271)eat for a lo(cid:374)g ti(cid:373)e, o(cid:448)er(cid:272)o(cid:373)e (cid:271)y the surrou(cid:374)di(cid:374)g, (cid:272)a(cid:374)"t keep up, like (cid:271)lood pressure, ha(cid:448)e to. It works on its own, can beat independent on the rest of the body work so much harder. Can respond to what happening to periphery, do not grow like muscle. Located in the center of the (cid:272)hest, it is(cid:374)"t sy(cid:373)(cid:373)etri(cid:272)al. Quite anterior in the thoracic cavity, located just behind the sternum. Xiphoid is cartilage, till 40, very breakable, bottom of the heart right around the xiphoid, easily breakoff. Heart contain in a sac, pericardial sac, the sac surround the heart. It is always beating, lots of friction, has a sac filled with fluid- pericardial fluid.
