Surfactant is produced by what cell type in the alveolus?
A) smooth muscle cells
B) pneumocytes Type I
C) pneumocytes Type II
D) pneumocytes Type I and Type II
E) alveolar macrophages
C
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Granular cells synthesize and release the enzyme
A. angiotensinogen. B. antidiuretic hormone. C. renin. D. calcitriol.
Perfusion is
A) delivery of oxygen to cells. B) the connection between capillaries and other vessels. C) blood flow through an organ. D) the driving force behind blood flow. E) movement of blood through a shunt.
When an action potential passes over the surface of a synaptic knob, the contents of the
vesicles are released in response to the presence of A) neurotransmitters. B) calcium ions. C) neuropeptides. D) sodium ions.
The skin tans in response to sunlight because of the release of ________
A) Sebum B) Collagen C) Keratin D) Melanin