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KINE 3012 (22)
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Lecture 6

Lecture 6 - Jan 21st.docx

2 Pages

Kinesiology & Health Science
Course Code
KINE 3012
Tara Haas

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Page 33 - In expired air, there is an increased driving pressure of CO2 from the alveoli & blood to gas - Gas that we have exist in the blood - Henry's law - concentration of gases in a liquid - Volume of gas dissolved in a liquid is proportional to the partial pressure of the gas - Cgas = concentration of the gas, Pgas = Pressure of gas, k = solubility coefficient of the gas - k is different for every gas - k is very important as it determines how much gas would dissolve into our blood - k is very very low for nitrogen, so in order to dissolve nitrogen into blood, the pressure of nitrogen has to be very high *higher than atmospheric pressure* - The pressure of the gas in the blood Page 34-a - 160mmHg of Po(Pressure oxygen) in the air, but becomes 100mmHg after mixing with dead space air - Pressure of O2 in the alveoli/blood becomes 100mmHg, it reaches equilibrium - Partial pressure of Po is lower and Pco is higher in tissue cells compared to partial pressure of O2 and CO2 in the blood - O2/CO2 transfers into the cells until it nearly reaches equilibrium and blood is able to receive more oxygen because of the lower partial pressure of oxygen in deoxygenated blood - k of CO2 has much higher solubility, so it dissolves more easily in a lower pressure Page 35-b Hyperventilation, too much breathing - Matched with metabolism and carbon dioxide in our body - Ventilation more than CO2 production - Different than increase in respiration during exercise - Hyperpnea, increase of breathing to match metabolism/exercise Hypoventilation - Breathing is less than CO2 production Page 34-b - Decrease of CO2 causes lightheadedness - When you're hyperventilating, you increase the amount of O2 entering the body and decrease the amount of CO2 in the body - When you go to a high altitude place, we hyperventilate to increase the O2 back to optimal level - Hypoventilation, holding your breath, oxygen drops, CO2 increases rapidly - We can control the alveolar pressure by changing our breathing rates above/below normal rates Page 35-a - Increase in altitude, decrease in PAo(Alveolar oxygen pressure), no change in CO2, virtually no CO2 in the air we breathe in - Increase VdotA, i
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