Most allergy medicines contain antihistamines that block the actions of histamine. These drugs reduce cold symptoms by directly
A. lysing virus-infected cells and preventing further propagation of the pathogen.
B. stimulating components of the immune system through the release of cytokines.
C. blocking or reducing the inflammation response in mucous membranes.
D. stimulating the production of specific antibodies.
E. recruiting macrophages to the nasal epithelium.
C. blocking or reducing the inflammation response in mucous membranes.
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The focus of ethology is on
A. genetic and physiological mechanisms of behavior. B. mammal behavior. C. bird behavior. D. the consequences of behavior. E. behavior in the field.
During forceful exhalation, the ____ muscles contract
a. diaphragm and abdominal b. external intercostal c. internal intercostal d. diaphragm and external intercostal e. diaphragm and internal intercostal
The almost complete loss of the American chestnut tree to the chestnut blight fungus had ____ ecological impact on
the moderately diverse Appalachian woodlands of which it was formerly a part. a. little b. great c. moderate d. undetectable e. detectable
What stimulates secretion of testosterone by Leydig cells?
A. FSH B. LH C. Testosterone D. Estradiol E. Progesterone