Why do men experience inguinal hernias more often than women?
A. Men, on average, are more often overweight than women.
B. Men have lengthier intestines than women.
C. Men have a weaker inguinal canal due to the descent of the testes.
D. Men tend to have weaker abdominal muscles than women.
E. Men tend to have stronger abdominal muscles than women.
C. Men have a weaker inguinal canal due to the descent of the testes.
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Immune tolerance preventing a normal immune system from attacking the individual's own tissues involves
a. clonal deletion. b. clonal anergy. c. receptor editing. d. immunological ignorance. e. all of these.
Pinocytosis
A. forms vesicles only when large amounts of material are being transported. B. does not require ATP. C. is a form of exocytosis. D. involves ingestion of liquids rather than particles. E. does not require the formation of vesicles.
Reflux of gastric contents into the esophagus occurs because of
A. relaxation of the cardiac sphincter. B. contraction of the pyloric sphincter. C. spasms of the submucosal layer of the stomach wall. D. increased hydrochloric acid production by the parietal cells. E. increased amounts of mucous produced by the stomach.
Which of the following describes the blind spot?
A. There are cone cells but no rod cells. B. It is where the iris casts a shadow on part of the retina. C. It is where the optic nerve leaves the eye. D. It is where bipolar cells block light from reaching the rods and cones. E. There are rod cells but no cone cells.