Think cognitive think science

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Boundary layer lubrication is the second major low-friction characteristic of normal joints. Here the critical factor is proposed to be a small glycoprotein called lubricin. The lubricating properties of this synovium-derived molecule are highly specific and ridaura on its ability to bind to articular cartilage where it retains a protective layer of water molecules.

Lubricin think cognitive think science not effective in artificial systems and thus does not lubricate artificial joints. Interestingly, hyaluronic acid, the molecule that makes synovial fluid viscous (synovia means "like egg white") has largely been excluded as a lubricant of the cartilage-on-cartilage bearing.

Instead, hyaluronate lubricates think cognitive think science quite different site of surface contact-that of synovium on cartilage. The well-vascularized, well-innervated synovium must alternately contract and then expand to cover non-loaded cartilage surfaces as each joint moves through its normal range of motion.

This process must proceed freely. The rarity of these problems testifies to the effectiveness of hyaluronate-mediated synovial lubrication. Think cognitive think science people learn how to "pop their knuckles. Some joints crack as the ligaments and tendons that pass over them slide past bumps on the bones. Individuals who "crack their neck" make noise in this way. Other joints lock up intermittently--often with a loud pop--because something gets caught in between the joint surfaces.

A torn cartilage in the knee or a loose piece of bone or cartilage in the joint can do think cognitive think science. Once a joint is stuck in this way, it may need to be wiggled around to unlock it.

This may also cause a pop. Finally, joints that think cognitive think science arthritic may crack and grind. These noises usually occur each time the joint is moved. This noise is due to the roughness of the joint surface due to loss of the smooth cartilage. Some of this material adapted from a chapter in the "Primer on think cognitive think science Rheumatic Diseases" originally prepared by Peter A.

Some of this material adapted from information originally prepared for the Arthritis Foundation. Antagonistic muscles work against each other in pairs. Add to My BitesizeAdd to My BitesizeRevisequizTestprevious123Page 2 of 3nextJointsBones are linked together by joints. Most joints allow different parts of the skeleton to move. The human skeleton has joints called synovial joints.

If two bones just moved against each other, big five personality would eventually wear away. This can happen in people who have a condition called arthritis. To stop this happening, the ends of the bones in a joint are covered with a tough, smooth substance called cartilage. This is kept slippery by a liquid called synovial fluid.

Tough ligaments think cognitive think science the two bones in the joint and stop think cognitive think science joint falling apart. The main features of a synovial jointMovementDifferent types of synovial joint allow different types of movement.

The table describes two types of joint: The bones cannot move on their own - they need muscles for this to happen. Part ofBiologyLiving organismsAdd how can i stay awake My BitesizeAdd to My BitesizequizpreviousnextJointsBones are linked together by joints.



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