If you were to rub your finger over the surface of your face, you would notice that the skin is oily. What makes up the oil?
A. Waste material from cellular metabolism
B. Waste material (bilirubin) from dead red blood cells
C. Ruptured cells from sebaceous glands
D. Extracellular fluid not drained by the lymphatic system
E. Plasma leakage from damaged blood vessels
C
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Which of the following does not bring about increased airway resistance?
a. asthma. b. epinephrine. c. slow-reactive substance of anaphylaxis. d. emphysema. e. excess mucus production.
Which of the following muscles does NOT act in plantar flexion?
A) gastrocnemius and soleus B) flexor digitorum longus C) popliteus D) tibialis posterior
Exocytosis of neurotransmitter into the synaptic cleft is triggered by an influx of ______ in response to the arrival of an action potential in the axon terminal
A. K+ B. Na+ C. Ca2+ D. ATP E. Cl-
Which of the following makes it possible for even a small quantity of hormone to have a strong effect on its target cell?
A. Negative feedback inhibition B. Down-regulation C. Up-regulation D. The antagonistic effect E. Enzyme amplification