Hemoglobin returning to the lungs will aid in vasodilation in response to: Group of answer choices picking up CO2 picking up oxygen high CO2 levels low CO2 levels more than one of the above
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- A developing fetus gets oxygen from its mothers blood. Fetal capillaries run through pools of maternal blood in an organ called the placenta. As fetal blood runs through these capillaries, it exchanges substances with the maternal blood around the capillary. The hemoglobin made by a fetus is different than that made after birth. Fetal hemoglobin binds oxygen more strongly at low oxygen levels than normal hemoglobin. How would fetal hemoglobins somewhat higher affinity for oxygen benefit the fetus?Breathing _______. a. ventilates the lungs b. draws air into airways c. expels air from airways d. causes reversals in pressure gradients e. all of the aboveVentilatory threshold is the point at which an individual's ventilation becomes coupled to oxygen need an individual begins to produce lactate an individual's breathing becomes coupled to their need to buffer acidosis an individual reaches their VO2 max
- Referring to the loading and unloading of oxygen from hemoglobin (as illustrated in the figure), which of the following statements is correct? Oxygen Dissociation Curve.png Group of answer choices When a person in ventilating at rest, 75% of hemoglobin is still oxyhemoglobin The percent saturation of hemoglobin is higher at higher partial pressures of oxygen A decrease in the pH of the blood would promote unloading oxygen from the hemoglobin All of these are correctWhich is true about the oxygen-hemoglobin dissociation curve? A decrease in pH decreases hemoglobin affinity for oxygen A decrease in temperature increases hemoglobin affinity for oxygen Oxygen unloads from hemoglobin when tissue PO2 decreases An increase in PCO2 decreases hemoglobin affinity for oxygen All of the aboveIn carbon monoxide (CO) poisoning, CO binds to the heme of hemoglobin much tighter than oxygen (O2). What effect will this have on the ability of the tissues to get oxygen? Group of answer choices There will be no effect. CO will deliver oxygen to the tissues. Hemoglobin will bind more O2 and deliver more oxygen to the tissues. More hemoglobin will be produced to deliver oxygen to the tissues. Hemoglobin will bind less O2 and deliver less oxygen to the tissues.
- When a person develops a fever, which of the following statements hemoglobin saturation are correct? - Modify the structure of hemoglobin and decrease its affernity for O2 - Can shift the O2-hemoglobin dissociation curve to the right - Decrease O2 unloading occurs in the tissue - Modify the structure of hemoglobin and increase its affernity for O2 - Can shift the O2 hemoglobin dissociation curve to the left - Enhance O2 unloading occurs in the tissueWhich of the following is TRUE about carbon dioxide binding to hemoglobin? Carbon dioxide carbamoylates the N-terminus, stabilizing the T-state Carbon dioxide binds to the central cavity in hemoglobin, stabilizing the T-state. Carbon dioxide, binds to the heme iron, stabilizing the T-state. None of the above are true. 1 UNANSWERED QUESTION 1/1 SKIP FOR NOW 14:03 / 14:11 MacBook ProWhich of the following is FALSE about hemoglobin? O Hemoglobin only binds oxygen Every subunit of hemoglobin contains a heme group with an iron atom Hemoglobin contains four subunits As 02 molecules bind to hemoglobin, hemoglobin affinity for 02 increases All of the above are true
- Ischemic hypoxia is the result of: inability of the cells to use oxygen compromised oxygen transport due to blockage or constriction of blood vessels substitution of oxygen by another substance, e.g. carbon monoxide compromised ability of oxygen tansport due to low hemoglobin low environmental oxygenWhich of the following would NOT occur as blood passes through the lung capillaries? PCO2 of the blood would decrease O HCO3- and H+ would combine to form CO2 and H20 Cl- would move from plasma into the red blood cell CO2 would dissociate from hemoglobin All of these would occurWith the Bohr effect, more oxygen is released to the tissues because: a decrease in pH weakens the hemoglobin-oxygen bond a decrease in pH strengthens the hemoglobin-oxygen bon Oan increase in pH strengthens the hemoglobin-oxygen bond an increase in pH weakens the hemoglobin-oxygen bond
