1 The top number is called the systolic blood pressure. 2  For most people, this reading is too high if it is 140 or higher. 3  The bottom number is called the diastolic blood pressure. 4  For most people, this reading is too high if it is 90 or higher.
What causes joints to make snapping, popping noises? Q: I am a 20-year-old in okay shape and health, but the joints in my upper and lower back and shoulders are always stiff and snap all the time. Are noisy joints the sign of some problem? A: Snapping and popping of joints is common. The sound you hear is caused by air bubbles in the synovial fluid â the liquid that surrounds and lubricates your joints â and by the snapping of tightly stretched ligaments as they slide off one bony surface onto another.
Question: Why do people crack knuckles? Answer: Cracked knuckles feel looser and enjoy more mobility for a while after cracking. It is also possible that as kids people realize that cracking knuckles produces a funny noise and may repeat cracking just to produce the sound. This may make some people habitual âknuckle crackersâ. Question: What causes the sound? Answer: Joints (knuckles) are covered by a capsule (the joint capsule or synovial capsule). Within the space of this capsule the synovial fluid is contained which acts as a lubricant and also contains nutrients for the adjacent bone surfaces. A variety of gases are continuously dissolved in this fluid.