X-rays are characterized as
a. charged particles.
b. electromagnetic waves of short wavelength.
c. electromagnetic waves with high frequencies.
d. both b and c
d. both b and c
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Tears are a method for the eye to flush out foreign matter
Indicate whether the statement is true or false
The substance released by platelets that, through constriction and dilation of blood vessels, affects blood flow to an injured or affected site is called:
a. histamine. c. granules. b. serotonin. d. pus.
After conception, pregnancy usually continues for:
A. 18 weeks B. 28 weeks C. 38 weeks D. 48 weeks
A physician requests 600 mg of a medication, which is weighed by a pharmacy technician. Upon double-checking the amount by using a more sensitive balance, he finds the amount to actually be 575 mg. The difference is 25 mg. What is the percentage of error?
2% 3% 4% 5%