Shannon Eslinger (Dissection Day!)

The Plan For Today:

Recap:

-purkinje fibres

-hearbeat
     -pace maker?
-heart sounds? Lub dub

Purkinje Fibres: a nerve fibre that branches and carries electrical impulses throught the ventricles

The normal heart sound is typically described as "lub-dub." The "lub" sound is usually softer and longer than the "dub", and it is associated with the closing of the A-V valves at the beginning of systole. The sounds are also amplified by the chest, making them more audible. The sounds of the heart are only from the valves closing, not opening. The "lub" is the first heart sound. The "dub" sound is shorter and louder than the "lub" sound. It is associated with the closing of semilunar valves (aortic and pulmonary). The sound is shorter and louder because the cusps of the valves are more rigid than the mtral and tricuspid valves. - http://library.thinkquest.org/C003758/Function/Sounds.htm

1) Dissection

     -overview

     -safety (goggles and gloves)

     -group of three

     -clean up

2) Chapter 10 Test (However we didn't get to that part so study up for tonight) The test will be on Dec 9, 2009 (Thursday) and the ticket is due as well (Pg.346-347 #1-5, 7 , 9-11, 13, 14, 17, 18)

Thoughts/Opinions

The pig heart dissection was amazing.. stinky... but amazing. It involved a lot of snipping and slicing away at membrances and fat. We got to take a look at where the valves were and the arteries and the ventricles. It was double Bio today so we dissected in both blocks. Yeah, right before lunch, just wonderful! But overall it was a pretty sweet class that flew by... unlike other bio classes :) just jokes.

Above and Beyond

This is actually a picture of a human heart but it is similar to a pig's heart. As you can see there are the valves and whatnot which I think we should have seen but they were sort of tricky. For those who missed this class, I feel sorry for you...you missed a great class.