In which situation would an injected drug be the most effective agonist for an endogenous chemical messenger?
A. The drug has a lower affinity for the messenger's receptors than the messenger does.
B. The drug achieves 50% saturation of the messenger's receptors at a lower concentration than that required by the messenger.
C. The drug does not couple to the binding site of the messenger's receptor.
D. The drug binds to an alternate binding site on the protein receptor and reduces its affinity for the endogenous chemical messenger.
B
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The opening of the pericardium
A. is at the apex of the heart. B. adheres to the great vessels. C. adheres to the diaphragm. D. is composed of the endocardium.
Each of the following is a function of smooth endoplasmic reticulum except
A) storage and release of calcium ions. B) synthesis of protein. C) synthesis of steroid hormones. D) synthesis of triglycerides. E) detoxification of drugs.
Diseases that cannot be explained by current medical knowledge are called ________________________________________
Fill in the blank(s) with correct word
Microtubules do not have which of the following functions?
A) They form structural components of organelles. B) They move chromosomes during cell division. C) They provide a mechanism for moving organelles. D) They provide strength. E) They stiffen microvilli.