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originally posted by: wrathofall
56 pages of comments that I'm not going through. Did anyone mention how drastically human anatomy has changed?
originally posted by: syrinx high priest
so how many people are officially on board with the berenstain bears thing ?
I think some scope would help
is it 50 ? 5,000 ? 500,000 ? 50,000,000 ?
originally posted by: tweetie
a reply to: Gryphon66
The human heart. It's news to me, like a lot of these items under scrutiny, the human heart placement is under question. What I was taught was the center of the heart is a bit off-center of the spine to the left. That's the reason we were told to place our right hands over our hearts, which we were told is a bit to the left of center, when we recited the Pledge of Allegiance. That was grilled into us as children.
Did it migrate and I didn't receive the memo?
Anatomical Study by Leonardo da Vinci
That drawing has the heart quite a bit to the left of the spine.
I can't say I've worked in a morgue and seen opened chests.
My mom bought the Encyclopedia Britannica when I was a child and I spent hours pouring over the see-through pages showing the different systems of the human body. I was mesmerized. I don't recall where the heart was placed in that particular book.
The heart is a hollow muscular organ of a somewhat conical form; it lies between the lungs in the middle mediastinum and is enclosed in the pericardium (Fig. 490). It is placed obliquely in the chest behind the body of the sternum and adjoining parts of the rib cartilages, and projects farther into the left than into the right half of the thoracic cavity, so that about one-third of it is situated on the right and two-thirds on the left of the median plane.
Your heart is actually centered right in the middle of your chest, on your body's axis of symmetry. In a chest x-ray or MRI, you might see that the heart bulges or tilts slightly to the left, because those are the heart's strongest chambers. (The right ventricle only has to get blood into the lungs, which are just next door. The left ventricle is what pumps oxygenated blood into every other part of the body.) That's why you may feel your heartbeat more strongly on the left side than the right. But that doesn't mean your heart is on the left. That's where your left lung goes.