Use the following answer code to compare the relative magnitudes of the pair of

Question

Use the following answer code to compare the relative magnitudes of the pair of items in the question. Write the letter (A,B, or C) in the space provided.

A. item A is greater than item B

B. item B is greater than item A

C. item A and item B are approximately equal

1. A. PO2 in blood entering the pulmonary capillaries

B. PO2 in the alveoli

2. A, PCO2 in blood entering the pulmonary capillaries

B. PCO2 in the alveoli

3. A. PO2 in the alveoli

B. PO2 in blood leaving the pulmonary capillaries

4. A. PCO2 in blood leaving the pulmonary capillaries

B. PCO2 in blood entering the systemic capillaries

5. A. PO2 in blood entering the systemic capillaries

B. PO2 in the tissue cells

Explanation / Answer

ANSWER

1- B- PO2 in the alveoli is higher than the PO2 in the blood, because oxygen diffuses down its partial pressure gradient from the alveoli into the blood.

2- A- PCO2 is higher in the blood plasma than the alveoli. Venous blood has higher bringing metabolic waste is relatively high in CO2, which PCO2 of 46mmhg where as alveolar PCO2 is 40mmhg.

3-C- freshly oxygenated blood leaving tha pulmonary capillaries has relatively high PO2.

4-C- PCO2= 40, in blood leaving the pulmonary capillaries

PCO2= 40, in blood entering the systemic capillaries

Blood leaving the alveolar capillaries returns to the left atrium and is pumped by the left ventricle into the systemic circulation. This blood travels through arteries and arterioles and into the systemic, or body, capillaries. As blood travels through arteries and arterioles, no gas exchange occurs.

5- A- PO2= 100, in blood entering the systemic capillaries

PO2= 40, in the tissue cells

Because of the differences in partial pressures of oxygen between the systemic capillaries and the body cells, oxygen diffuses from the blood and into the cells.

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