95% of the cytoplasm of RBCs is____________?
Correct answer: A. Hemoglobin
- A. Hemoglobin
- B. Enzymes
- C. Salts
- D. Other proteins
Explanation
About 95% of the dry cytoplasmic content of a red blood cell is hemoglobin, the iron-containing protein that binds and transports oxygen. Enzymes and salts are present in smaller amounts, so students may choose d by treating all non-hemoglobin proteins as the major component.
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The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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