Describe the pressures in the atria and ventricles that would cause the opening of the AV valves.
What will be an ideal response?
Pressure in the atria would be greater than the pressure in the ventricles.
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________ is fat soluble, produced in the skin on exposure to UV radiation, and necessary for normal bone growth and function
A) Cortisol B) Vitamin K C) Vitamin A D) Vitamin D
During ventricular ejection,
A) the semilunar valves are closed. B) the QRS complex is just starting. C) blood is forced into veins. D) the AV valves are open. E) the ventricles are in systole.
Which of the following situations occurs in electrically excitable cells?
A. Ligand-gated Na+ channels are opened by high extracellular Ca2+ levels. B. When Na+ channels open, K+ channels close. C. Proteins tend to diffuse out of the cell. D. The sodium-potassium pump moves Na+ into the cell. E. Depolarization causes voltage-gated Na+ channels to open.
Calcium's roles in the body include
A. bone health. B. muscle contraction. C. blood clotting. D. action potentials in heart muscle. E. All of these choices are correct.