The function of ligaments is connecting one bone to another bone, according to MedlinePlus. Ligaments also protect the joints from damage by limiting certain types of movements.
The human body has more than 20 different ligaments, according to the University of Arkansas for Medical Sciences. They are found in the back, upper limbs, lower limbs, chest, abdomen, pelvis, head and neck.
One of the most well-known ligaments is the anterior cruciate ligament. The ACL connects the thigh bone to the tibia, which is found in the calf. The American Academy of Orthopaedic Surgeons estimates that approximately 200,000 ACL injuries happen each year.
A good way to see a ligament at work is to attempt to bend the elbow backward. Ligaments prevent this motion, reducing the risk of injury to the joint.Learn More
Bone tissue is made up mostly of calcium and collagen, which is a protein. The outer layer of bone is hard and dense and called compact or cortical bone. The inner layer is called trabecular or cancellous bone. It is lighter than the compact bone and porous.Full Answer >
The mechanics of breathing involve the inhalation and exhalation of air into the lungs through the movement of the diaphragm muscle, according to MedlinePlus. The diaphragm contracts to expand the lungs, which draws air into them during inhalation. Then the diaphragm relaxes to reduce the size of the lungs, which forces air out of them during exhalation.Full Answer >
According to Materials Today, manufactured alloy steels can be 10 times better in tensile strength than bones and also 10 times better in fracture toughness and strain. Bones have a tensile strength of 150 MPa, a fracture toughness of 4MPa(m)1/2 and a strain-to-failure of 2 percent.Full Answer >
With a central bone density scan, the patient lies on a table while the scanner passes over his body, emitting X-rays to test the density of bones in the lower spine and hips, according to MedlinePlus. The purpose of the test is to detect osteoporosis and predict fracture risks.Full Answer >