Which of these cell parts is NOT paired correctly with its function?
A. Nucleus—control center
B. Ribosome— site is protein synthesis
C. Mitochondrion— site of photosynthesis
D. Plasma Membrane— regulation of what passes in and out of cell
Answer: C. Mitochondrion— site of photosynthesis
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Which of the following would be used to sterilize a mattress?
A) autoclaving B) formaldehyde C) ethylene oxide D) heavy metals E) non-ionizing radiation
Which of the following healthcare procedures may unintentionally introduce microorganisms into the patient?
a. catheterization b. surgery c. spinal puncture d. all of the above
Choose the receptor that is not correctly matched with its function.
A. Nociceptor: transmits signals that the brain interprets as pain B. Baroreceptor: monitors hydrostatic pressure in blood vessels C. Proprioceptor: monitors stretch of muscle fibers D. Peripheral chemoreceptor: monitors the pH of the cerebrospinal fluid E. Chemoreceptor: perceives taste and smell stimuli
The production of red blood cells is regulated by a feedback loop involving erythropoietin. In non-disease states, the production of red blood cells is equal to the destruction of red blood cells, thus maintaining sufficient red blood cells to deliver adequate oxygen to the body's tissues. However, when the number of red blood cells decrease and oxygen levels are low, erythropoietin is produced by the liver and kidneys to increase the production of red blood cells. Is this a positive or negative feedback loop? Explain your answer.
What will be an ideal response?