Textbook Question
Find the measure of the smaller angle formed by the hands of a clock at the following times.
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1. Measuring Angles
Angles in Standard Position
2:12 minutesProblem 42
Textbook Question
Which of the following structures prevents direct contact between the bony surfaces of synovial joints?
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Synovial Joints
Synovial joints are the most common and movable type of joint in the human body, characterized by a fluid-filled joint cavity. They allow for a wide range of motion and are found in areas such as the knees, elbows, and shoulders. Understanding their structure is essential for recognizing how they function and the importance of their protective features.
Articular Cartilage
Articular cartilage is a smooth, white tissue that covers the ends of bones in synovial joints. It serves to reduce friction during movement and absorb shock, preventing direct contact between bony surfaces. This cushioning is crucial for joint health and mobility, as it helps to prevent wear and tear on the bones.
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Synovial Fluid
Synovial fluid is a viscous liquid found within the joint cavity of synovial joints, produced by the synovial membrane. It lubricates the joint, reducing friction between the articular cartilage surfaces during movement. Additionally, it provides nutrients to the cartilage and acts as a shock absorber, further protecting the joint from damage.
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