What is a covalent compound made of many small repeating units linked together in a chain? A polymer would fit that description. Also, a protein which is made of many amino acids hooded together by a peptide bond, which is a covalent bond.
Hip abductors are muscles on the other side of the leg and they do the opposite motion, by bringing the leg away from the middle of the body. It would look funny if humans stood around adducting and abducting their leg, but itâs more complex than thatâ¦.
The hip joint is a spherical joint between the femoral head and the acetabulum in the pelvis (Fig. 1); it is a diarthrosis or synovial joint, since it is wrapped in a capsule that contains the synovial fluid (SF), a biological lubricant that acts also like a shock-absorber [1] .he tribological performance of artificial hip joints is a critical issue for their success, because adverse tissue reaction to wear debris causes loosening and failure. Many studies on wear and lubrication of hip prostheses have been published in the last 10 years, mostly on experimental tests.