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pelvis, spine and skull
It is the 4th vertibrae in the thorasic (chest/upper back) portion of the spine,
knees hips spine hands
The weight of the atmosphere (which is about 14.5038 pounds per square inch) does not put any pressure on the human spine (the spine is not directly supporting this load form the top of you head to the ground - the pressure is all round you).
Mainly in the chest cavity and below the diaphragm to the pelvic bone.
Depends on the devellopment of the spine, the length of the spine, the strength of the muscles involved at the point where the weight is on the spine. Depends on the shape and the material of the weight. Cant be answered like this. Go look at weightlifting contests by supermans on eurosport.
Lumbar support pillows are designed to offer total spine support. Once your spine is supported, you should be relieved of pain and discomfort. You can then use it regularly to prevent this kind of problem.
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Your spine naturally has curves even before pregnancy. The spine consist of 4 specific curves: Cervical curve, Thoracic curve, Lumbar curve, and Pelvic Curve Curves in the spine provide support for the weight in the human body, and also make it easy to balance this weight. The spine also help balance your head and give structure support to your ribs. It may seem like you notice the curves more since you have "extra baggage" that may put pressure on spine.
900 pounds
your spine
no
It is called the caudal portion of the spine or the bone itself is called the coccyx. In lay terms, it is the "tailbone".
Ergonomic chairs are designed to provide good lumbar support to maintain a healthy spine. They have features such as an adjustable armrests and backrests, lumber support frames and swivel features. source; http://www.spinehealth.com/wellness
Obesity increases both the weight that the spine must support and the pressure on the discs, thereby elevating the risk of back pain and injury.
Your spine and feet
Lumbar sacral agenesis (missing the lower portion of his spine)