Which of the following is not carried by hemoglobin
Correct answer: B. Bicarbonate
- A. Oxygen
- B. Bicarbonate
- C. Carbon diaoxide
- D. Carbon monooxide
Explanation
Bicarbonate (HCO3-) is an important molecule involved in the regulation of blood pH. Carbon dioxide (CO2) produced as a waste product in tissues diffuses into red blood cells, where it reacts with water (H2O) to form carbonic acid (H2CO3). Carbonic acid then dissociates into bicarbonate ions (HCO3-) and hydrogen ions (H+). Bicarbonate is primarily transported in the blood plasma rather than being directly carried by hemoglobin.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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