PLEASE ANSWER ALL 5 QUESTIONS! THANK YOU :) Which of the following statements is

Question

PLEASE ANSWER ALL 5 QUESTIONS! THANK YOU :)

Which of the following statements is true? Your arterial P_O2 is low at high altitudes because high altitude air has lower concentrations of O_2 than the air at sea level. Our breathing rate is more influenced by sensing changes in P_CO2, rather than P_O2 Medulla chemoreceptors sense O_2 levels in the blood. Hyperventilation can lead to respiratory acidosis? Your saltwater fish tank breaks and you must transfer your pet fish into a new tank. Which new tank will have the highest concentration of O_2 in the water? A tank with water at 10 degrees C and high salinity. A tank with water at 10 degrees C and low salinity. A tank with water at 24 degrees C and low salinity. A tank with water at 24 degrees C and high salinity. When we swim, baroreceptors are stimulated when your face hits cold water. Which of the following physiological responses would you NOT expect to occur in response to cold water on your face? Cardiac output decreases. Vasodilation. Decreased force of heart contraction. Heart rate increases. Blood vessels arranged in parallel decrease the velocity of blood moving through the circulatory system relative to blood vessels arranged in series True False Of the following statements, which does not explain why the partial pressure of oxygen is lower in the lung than in the external air? Oxygen is moved into the blood and is headed to the tissues Air in the lung is humidified: therefore, water vapor pressure alters the pressure Lungs exert a pressure on the air to reduce the oxygen pressure. Carbon dioxide mixes with the oxygen

Explanation / Answer

Answer to first question:

Out of the given options, only second o option is correct.

O2 concentration is same from sea level to high altitude, it's the change in atmospheric pressure that lowers arterial pO2.

Medullary chemoreceptors sense H+ ions.

Hyperventilation expels more CO2 and reduces acidosis.

Hence correct option is (2): breathing rate is influenced more by pCO2 than pO2.

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