What causes the opening and closing of the heart valves?
A. stimulation by the sympathetic and parasympathetic nerves
B. a pressure difference on the two sides of the valve
C. Na+ and K+ fluxes during ventricular depolarization
D. turbulent flow in the atria and ventricles
E. the action of the papillary muscles and chordae tendineae
B
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The three different classes of lymphocytes in the blood are:
T cells, B cells, NK cells cytotoxic cells, helper cells, suppressor cells plasma cells, B cells, cytotoxic cells antigens, antibodies, immunoglobulins None of the choices are correct
Sucrose is formed when the simple sugars fructose and glucose are covalently bonded. This reaction releases water. What type of reaction is this?
A. Hydrolysis B. Catabolic C. Dehydration D. Monomeric
In a nerve cell at rest, the cell membrane is more permeable to which ion?
This blood test is for prostate cancer
A) PSA B) SAP C) ASP D) PAP