One of the challenges associated with the successful use of chemotherapy for treating brain tumors is the fact that
A. no known chemotherapy agents are effective against the types of tumors that arise in the brain.
B. no chemicals are ever able to pass from the blood supply to the brain.
C. many circulating chemicals are not able to enter the brain.
D. chemicals introduced to the brain do not pass through neural membranes.
Answer: C
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Lymphocytes are _____ blood cells that _____ antibodies that fight infection.
A) red; destroy B) red; produce C) white; destroy D) white; produce
In a medication trial, a participant with ADHD acted very relaxed and focused after trying a new medication that he believed would calm him down. However, the "medication" was really just a sugar pill. Given what you've learned in this chapter, which of the following explanations makes the most sense?
A. This would not have happened, because you have to have had a drug in order to feel its effects. B. This could happen because the placebo effect is real and can result in actual physical symptoms. C. The only way this could happen would be if the participant really didn't have ADHD. D. The participant didn't really feel relaxed and focused but didn't want to disappoint the doctors.
Each of the following is a symptom of anorexia nervosa except ________
a. intense fear of becoming obese, which does not diminish as weight loss progresses b. refusal to maintain body weight at or above a minimal normal weight for height and age c. recurrent episodes of binge eating followed by purging of the foods just eaten d. disturbance of body image, such as "feeling fat" even when emaciated
Which behavior is an example of a gross-motor skill?
A. walking B. pointing C. reaching D. scribbling