Skeletal System

the hard structure protects your nervous system from getting damaged
Your skeleton protects your nervous system by providing a sort of helmet for your brain. This helmet is called your skull and it helps keep the most important part of your nervous system safe.

Your elbow and your wrist.

Compact bone is composed of an orderly matrix of collagen fibers and hydroxyapatite (a type of calcium and phosphate mineral) crystals. It is also known as cortical bone because it is primarily found in the outer layer of bones. It differs from spongy or trabecular bone in its orderly structure and the absence of the large spaces present in trabecular bone.

The ossification type that occurs in the cranium is primarily intramembranous ossification. This process involves the direct transformation of mesenchymal tissue into bone, allowing for the rapid formation of the flat bones of the skull. It is responsible for the development of structures such as the skull vault and the mandible, enabling the cranium to protect the brain and accommodate growth during early life. In contrast, other bones in the body typically develop through endochondral ossification.

The same place as a mans, above the legs and below the abdomen.

I have struggled with this since January 2008. It will be a year since I have had this. It is very frustrating. Through all my research, doctor visits, and imaging tests, I have found that this is an asymmetry of the thyroid cartilage. It is either dealt with and see if it resolves on its own or, if symptoms worsen, have surgery to trim the cartilage where it is causing the problem. They do this surgery at the University of Utah in Salt Lake City department of otolaryngology. It is possible there are other reasons but I have had an MRI with contrast and CT with contrast that were negative and the asymmetric thyroid cartilage is what I have been concluded to have.

There appears to be great debate on which muscle in the human body is the strongest. According to the The Library of Congress, "Everyday Mysteries," there is no one answer for this question since there are different ways to measure strength. There is absolute strength (maximum force), dynamic strength (repeated motions), elastic strength (exert force quickly), and strength endurance (withstand fatigue).

However, click on the related links section (Everyday Mysteries) indicated below for a better understanding of the debate.

scapula

Muscles move on commands from the brain. Single nerve cells in the spinal cord, called motor neurons, are the only way the brain connects to muscles. When a motor neuron inside the spinal cord fires, an impulse goes out from it to the muscles on a long, very thin extension of that single cell called an axon. When the impulse travels down the axon to the muscle, a chemical is released at its ending. Muscles are made of long fibers connected to each other longways by a ratchet mechanism, the kind of mechanism that allows the two parts of an extension ladder to slide past each other and then lock in a certain position. When the chemical impulse from the motor neuron hits the muscle, it causes to muscle fibers to rachet past each other, overlapping each other more, so that the muscle gets shorter and fatter. When the impulses from the nerves stop, the muscle fibers slide back to their original positions. Each motor neuron connects to just one muscle, say the bicep on the front of your upper arm that lifts your forearm, or to the triceps, the one on the back that extends your forearm. But when you move, you never think, "I'd like to contract my bicep two inches and relax my tricep two inches" -- instead you think, "I'd like to put this cake in my mouth!" How does the brain translate from the general idea to lift something to your mouth to specific commands to muscles? It does it in stages. In the cerebral cortex, the commands in the neurons there represent coordinated movements - like pick up the cake, hit the ball, salute. The cortex then connects to a sort of console in the spinal cord that overlays the motor neurons. This console lays out arm position in space, up-down, left-right. Each desired arm position then is read out as a collection of specific commands to each motor neuron and muscle.

from http://www.ccmr.cornell.edu/education/ask/index.html?quid=352

No, it does not produce vitamin D.

The ankle is the joint formed by the articulation of the lower leg bones with the talus. The ankle connects the foot with the leg.

The erector spinae

They have similar bone structures... i.e.: both have spines, both have skulls, both have pelvises, etc.

the calcium in it protacts the soft part of the shell and its light weght like the spongy in a bone

The quadriceps group of muscles. Rectus Femoris more specifically.

The coxal bone is part of the hip joint.
The longest bone in the body is the femur, thigh bone, which is a ball and socket joint with the hip joint or coxal bone.

chondrocytes

Two types of bone breaks are fractures and complete breaks. Fractures are just cracks in the bone, but complete breaks are when the bone literally is broken in two pieces. You've shattered the bone if it's broken in more that two pieces.

The Lacrimal and Ethmoid bones

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In a femur it would be something like a hard landing on your foot causing pressure and thereby creating a spiral as it cracked in an upward motion. In an arm is similar. It takes a lot of force to cause a spiral fracture.

This depends on the bone; to break a finger generally doesn't take much force, but your femur or your thigh bone is harder than cement!

There are more than 12 bones in a foot.

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