Briefly describe what is happening when a person "cracks their knuckles"
What will be an ideal response
When the synovial cavity expands, the pressure of the synovial fluid decreases, creating a partial vacuum. The suction draws carbon dioxide and oxygen out of the blood vessels in the synovial membrane, forming bubbles in the fluid. When the bubbles are forced to burst, as when the fingers are hyperflexed, the cracking or popping sound is heard as the gases are driven back into solution.
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Of the total organic components in bone most of it is
A) collagen. B) keratin. C) keratohyalin. D) elastin. E) actin.
Which of the following abnormalities could give rise to sensorineural deafness?
a. rupture of the tympanic membrane b. disease or injury in the organ of Corti c. restriction of ossicular movement because of adhesions between the bones d. damage to the occipital lobes of the cortex e. presbyopia
Which of the following is NOT a muscle of respiration?
A. External intercostals B. Internal intercostals C. Pectoralis major D. Diaphragm E. All of these are major muscles of respiration.
Hydrochloric acid (HCl) is secreted by ________ cells
A) mucous B) enteroendocrine C) parietal D) regenerative (stem) E) chief