Discuss the greatest disrupter to our natural circadian rhythms
What will be an ideal response?
The greatest disrupter of our natural circadian rhythms is the variable work schedule common in industrialized countries. Today one out of every four working men and one out of every six working women has a variable work schedule—shifting frequently between day and night work. Many shift workers feel tired most of the time and have trouble staying awake at the job. Work performance suffers because of the workers' fatigue. When workers arrive home for bed, they're exhausted, but cannot sleep because they are trying to doze off when the body is trying to wake them up. Unfortunately, the weekly changes in schedule never permit workers' internal alarm clocks to fully adjust. Most people require 4 to 14 days to adjust to a new schedule.
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An electroencephalogram measures
A. electrical activity in the brain. B. blood flow in the brain. C. the use of glucose in the brain. D. the production of CSF in the brain.
Which of the following statements concerning the placenta is correct?
a. The placenta secretes human chorionic gonadotropin, estrogen, and progesterone. b. The placenta serves the functions of the circulatory, respiratory, and digestive systems for the fetus. c. Maternal and fetal blood are mixed together within the placenta. d. Both (a) and (b) above are correct. e. All of these answers are correct.
Which of the following can regulate the skeletal system?
A. Estrogen B. Calcitonin C. Testosterone D. All of the choices are correct.
Which of the following joints is not monaxial?
A. The humeroulnar joint B. The interphalangeal joints C. The tibiofemoral joint D. The trapeziometacarpal joint E. The atlantoaxial joint