Mucous secretions of the respiratory tract include antimicrobial substances such as lysozyme and defensins.
Answer the following statement true (T) or false (F)
True
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Smooth muscle tissue is found in the organs of the digestive tract, the walls of blood vessels, and the iris.
Answer the following statement true (T) or false (F)
Which of the following is NOT typically true about G proteins?
A. They can be inhibitory for second-messenger production. B. They can be stimulatory for second-messenger production. C. They act as second messengers. D. They can act as transducers for activated receptors by opening or closing ion channels.
An increase in blood pressure would:
A. stimulate parasympathetic input to the piloerector muscles of the skin B. inhibit parasympathetic input to the piloerector muscles of the skin C. stimulate parasympathetic input to the heart D. stimulate sympathetic input to arterioles in the skin and muscle E. stimulate sympathetic input to the veins
White blood cells differ from red blood cells because only they contain ________
A) a biconcave shape B) a nucleus and most organelles C) the ability to transport both oxygen and carbon dioxide D) the iron-containing molecule called hemoglobin E) cytoplasm