The long plateau phase of the cardiac muscle action potential is due to
A) movement of fewer sodium ions across the cell membrane.
B) calcium channels remaining open.
C) increased membrane permeability to potassium ion.
D) decrease in the amount of calcium diffusing across the membrane.
E) increased membrane permeability to sodium ions.
B
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Normally, all the H+ ions generated from CO2 in tissue capillaries recombine with bicarbonate in pulmonary capillaries and are removed from the body as CO2.
Answer the following statement true (T) or false (F)
When a small amount of HCl or NaOH is added to a solution of Na2HPO4, the pH of the solution barely changes. Based on these observations, all of the following are true concerning the compound Na2HPO4, except
A) Na2HPO4 is able to accept extra hydrogen ions from the HCl. B) Na2HPO4 is able to donate hydrogen ions to the OH- from NaOH. C) Na2HPO4 adsorbs excess H+ and OH- directly onto the surface of its crystalline structure. D) Na2HPO4 is a salt formed from reacting a strong base with a weak acid. E) Na2HPO4 acts as a buffer.
Give the normal respiration rate for a dog
What will be an ideal response?
The growth rate for a scalp hair is about ________ per day for 18 months to 7 years, and then the hair becomes dormant.
A. 1/2 mm B. 1.0 mm C. 0.75 mm D. 1.0 cm E. 1/3 mm