The heart lies between which two bony structures?
470232
Vertebrae and ribs/intercostals.
974511
The heart is what pumps blood throughout the body, keeping all organs functioning. Blood flows to the body through arteries and blood flows back to the heart through veins. Its all one big system - the circulatory system.
305879
Here are some sites:\n\nhttp://sev.prnewswire.com/health-care-hospitals/20060213/LAM15414022006-1.html\n\nhttp://www.3dscience.com/human_heart_anatomy_pictures.asp\n\nhttp://www.3dscience.com/human_heart_anatomy_diagram.asp\n\nhttp://3dscience.com/heart_model_animation.asp
548511
Pleurisy is the inflammation of the pleura - the lining around the lung (between the lungs and ribs) to reduce friction associated with the movement of lungs inflating/deflating.  This is usually an acute condition associated with a virus.\n\nCostochondritis is the inflammation of the joint where the cartilage (between the ribs and the sternum) attaches to bone.  This often can be a chronic condition similiar to arthritis.
699256
I would probably say the atlas. The skull rests directly onto the atlas (the first vertebra of the cervical region), which is a relatively heavy part of the body. The thoracic region bears little weight (articulates with the ribs), the lumber region would be distributed by the pelvic girdle (pain in humans is atributed to the upright nature of the spine, not something that would probably occur to most spp.)and the caudal bones (tail bones) probably wouldnt bear any weight but their own in most spp(and muscle if the animal has a tail). It may depend, however on the species as some animals can bear their entire weight through the tail (monkey with a prehensile tail, macropods etc), but overall, I would probably say the atlas and to a degree the axis as they are constantly bearing the weight of the skull... Hope that helps!
574341
(1)Heart is  the hollow muscular organ that receives blood from the veins and propels it into and through the arteries.\n(2)It helps to bring blood from the body returns to the right atrium through two large veins, the superior and inferior venae cavae; in addition the blood that has supplied the heart muscle is drained directly into the right atrium through the coronary sinus.
294405
Don't listen to thedestro737. Anyone who studied high school biology knows that tissue is a collection of cells doing the same work, and bones certainly qualify as tissue. If your heart was made of bone tissue, it would not pump. The heart is a muscle, and like any muscle, it contracts, pushing the blood through your veins and arteries. If it were made of bone, it could not do this and you would not be alive. In fact, you would have died long before you were born.
595108
what are you asking?  The heart is a muscle
935401
Heart, arteries, veins.
908930
The two organs of the circlatory system are the heart and lungs.  Does that help?
1076932
I notaced there isnt a whole lot of answers for this one. For those of you who don't know what it is or what it does. The pericardium is the fluid filled sac that surrounds the heart and the proximal ends of the aorta, vena cava and the pulmonary artery. \nIt keeps the heart contained in the chest cavity. \nPrevents the heart from overexpanding when blood volume increases and limits heart motion.\nTo answer your question: (I had to look this up)\nParietal pericardium has been determined to be 1-2mm by anatomic studies but it is non-uniform in thickness.
16348
The heart is a double pump with four chambers, each separated by valves that only permit blood to flow in one direction. Basically, the right side of the heart pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the body.
670448
First, the bones are the structural support for muscles, nerves, blood and lymph circulation systems, as well has holding the various organs and glands in place.\n\nMay I recommend a few?
617014
i would say cardiac muscles.
233007
ribs, spine and heart?
313456
the ventricles, right and left
807200
The first link has an animated description.Anatomy of the Human Heart with Flash Illustration\n\n    *  The Right Atrium, receives "used blood" from the body. Blood will be pushed through the tricuspid valve to the\n\n    * Right Ventricle, the chamber which will pump to the lungs through the pulmonic valve to the\n\n    * Pulmonary Arteries, providing blood to both lungs. Blood is circulated through the lungs where carbon dioxide is removed and oxygen added. It returns through the\n\n    * Pulmonary Veins, which empty into the\n\n    * Left Atrium, a chamber which will push the Mitral Valve open. Blood then passes into the\n\n    * Left Ventricle. Although it doesn't always look like it in drawings done from this angle, this is the largest and most important chamber in the heart. It pumps to the rest of the body. As it pumps, the pressure will close the mitral valve and open the aortic valve, with blood passing through to the\n\n    * Aorta, where it will be delivered to the rest of the body.\n\n\nhttp://www.heartpoint.com/theheart.html\n\nhttp://www.pbs.org/wgbh/nova/heart/\n\nhttp://texasheart.org/HIC/Anatomy/Anatomy.cfm\n\nhttp://education.yahoo.com/reference/gray/illustrations/figure?id=505\n\nhttp://sln2.fi.edu/biosci/preview/heartsee.html\n\nhttp://www.geocities.com/Athens/Forum/6100/1heart.html\n\nSTRUCTURE OF THE HEART.\n\nhttp://www.infovisual.info/03/062_en.html\n\nhttp://www.cayuga-cc.edu/people/facultypages/greer/biol204/heart1/heart1.html\n\nhttp://www.geocities.com/Athens/Forum/6100/1HrtPics.html\n\nGood luck.\n\nKevin, Liverpool, England.