The oxyhemoglobin dissociation (saturation) curve shifts to the righ hemoglobin and the content of oxygen bound to hemogl OA. Increases; increases OB. Increases; decreases OC. Decreases; decreases O D. Decreases; increases O E. Does not change; does not change

Hemoglobin’s affinity for O2

1. Which of the following would be most affected by a decrease in the affinity of hemoglobin for oxygen?A. Arterial PO2B. Arterial percent oxyhemoglobin saturationC. Venous oxyhemoglobin saturationD. Arterial PCO2 2. The chemoreceptors in the medulla are directly stimulated byA. CO2 from the bloodB. H+ from the bloodC. H+ in cerebrospinal fluid that is derived from blood CO2D. Decreased arterial PO2 3. Which of the following occur(s) during hypoxemia?A. Increased ventilationB. Increased production of 2.3-DPG C. Increased production of erythropoietinD. All of the choices

Alveoli that have normal ventilation and no blood flow has an alveolar PO2 of149 mmHg0 mmHg40 mmHg159 mmHg100 mmHg

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N. Looking ahead (while there is still time), here is the "Oxyhemoglobin dissociation curve." It relates the % saturation of hemoglobin directly to the Poz of its surroundings. Not coincidentally, a third axis relates ml oxygen/100 ml blood directly to the % saturation. 100 20 Percent oxyhemoglobin saturation 80 60 40 20 0 0 20 ! Veins (at rest) ✓ 60 PO₂ (mmHg) 40 Arteries 80 100 155 10 5 O Oxygen content Amount of O₂ unloaded to tissues (pooյզ լա 00l/70 լա) 1) If 15 mL oxygen/100 ml gives a 75% hemoglobin saturation, then approximately how many ml of oxygen/100 ml blood corresponds to a 70% hemoglobin saturation? 2) Approximately, how many ml of oxygen/100 ml is needed to give 50% hemoglobin saturation? 3) Approximately, how many ml of oxygen/100 ml is needed to give 30% hemoglobin saturation?

Internal respiration During internal respiration, the small amount of oxygen transported in dissolved plasma (1) quickly diffuses out of the plasma into interstitial fluid. Carbon dioxide diffuses into the blood and a small amount remains dissolved in the plasma (2). Most of the carbon dioxide continues into the red blood cell where some of it combines with hemoglobin (3) to form carbaminohemoglobin (4). Most carbon dioxide, however, combines with water (5) to form carbonic acid (6). This reaction is catalyzed by carbonic anhydrase. The carbonic acid then dissociates into hydrogen and bicarbonate ions (7). As bicarbonate ion concentration inside the red blood cell increases, bicarbonate ions diffuse out of the red blood cell into plasma (8) in exchange for chloride ions (9). Bicarbonate ions act as buffers within the plasma, controlling pH. Within the red blood cell, hydrogen ions (10) are buffered by hemoglobin (11). When hemoglobin binds hydrogen ions, it has a lower affinity for…

Which of the following is not a stimulus of the peripheral chemoreceptors? Increased arterial PCO2 Increased arterial PO2 None of the above stimulate the peripheral chemoreceptors Drop in pH

During exercise your pCO2 levels rise to 50 mm Hg while your pO2 levels drop to 80 mm Hg. Your peripheral chemoreceptors will be primarily sensitive to:   A the increase in pCO2 B the decrease in pO2 C both the increase in pCO2 and decrease in pO2 D the increase in pCO2 and resulting increase in MAP E the decrease in pO2 and resulting increase in MAP

Your friend found out that he got into medical school and has a little bit of a happy-attack, complete with hyperventilation. What is going on in his body while he is hyperventilating? O Inspiratory reserve volume is going up O Residual volume is going down O Tidal volume is going down O H+ excretion begins to happen as a compensation O Blood CO2 is decreasing