Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

A. Carbon dioxide

B. Carbonic acid

C. Oxygen

D. Carbon monoxide

Answer Explanation:

A buffer is a solution that can resist changes in pH when small amounts of acid or base are added. In the human body, blood is an important buffer that helps maintain a stable pH of about 7.4. One of the main components of the blood buffer system is the bicarbonate buffer, which involves the equilibrium between carbon dioxide (CO2), carbonic acid (H2CO3), and bicarbonate ions (HCO3-). When blood pH rises, meaning it becomes more basic, the bicarbonate buffer can donate H+ ions to lower the pH and restore the balance. The substance that donates H+ ions in this case is carbonic acid, which dissociates into H+ and HCO3-. Therefore,

Therefore, the Correct Answer is B.

Q #1: Which of the following is the function of a totipotent cell?

A. Aids in the maturation of sex cells

B. Carries electrical impulses

C. Develops into any kind of cell

D. Fights infectious diseases

Answer Explanation

A totipotent cell is a type of stem cell that has the ability to develop into any kind of cell in the body, including the cells that make up the placenta and the umbilical cord. This means that a totipotent cell can generate a complete organism from a single cell. The only natural example of totipotent cells are the fertilized egg and the cells produced by the first few divisions of the egg. Totipotent cells are different from other types of stem cells, such as pluripotent cells, which can develop into any cell type except for the placenta and the umbilical cord, and multipotent cells, which can only develop into a limited range of cell types.
Q #2: Which of the following statements best describes the function of erythropoietin in the human body?

A. It aids in lowering oxygen levels in the blood.

B. It aids in raising levels of clotting factors in the blood.

C. It aids in raising hemoglobin levels in the blood.

D. It aids in lowering CO2 levels in the blood.

Answer Explanation

Erythropoietin is a hormone that is produced by the kidneys and stimulates the production of red blood cells in the bone marrow. Red blood cells contain hemoglobin, a protein that binds to oxygen and transports it to the tissues. Therefore, erythropoietin helps to maintain adequate oxygen levels in the blood and prevent anemia.
Q #3: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

A. Lysozymes

B. Perforin

C. Cytokines

D. Granzymes

Answer Explanation

Cytokines are small proteins that act as chemical messengers between different types of immune cells. They can stimulate or inhibit the activation, proliferation, differentiation, and migration of immune cells. For example, interleukins are a type of cytokine that is produced by one type of white blood cell and can affect the behavior of another type of white blood cell. Lysozymes, perforin, and granzymes are all molecules that are involved in killing pathogens or infected cells, but they do not directly activate other immune cells.

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Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?

More Questions on TEAS 7 Science

Q #1: Which of the following is the function of a totipotent cell?

Answer Explanation

Q #2: Which of the following statements best describes the function of erythropoietin in the human body?

Answer Explanation

Q #3: Which of the following chemicals is released by one type of immune cell to directly activate another type of immune cell?

Answer Explanation

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