2. Assume the oxygen capacity of blood is 20ml/100 ml of blood. If the oxygen co
ID: 15455 • Letter: 2
Question
2. Assume the oxygen capacity of blood is 20ml/100 ml of blood. If the oxygen consumption of the brain is 50 ml/min, the blood is 100 % saturated in the carotid arteries carrying blood to the brain and 75% saturated in the jugular veins carrying venous blood from the brain,A. Calculate the volume of blood flowing through the brain = ________ ml/min
(2 pts)
3. Circle the correct answer to show how the following affect the ventilation rate:
(3 pts)
A. Increased blood CO2 Increase decrease
B. Decreased pH in cerebrospinal fluid Increase decrease
C. Inhibition of the enzyme carbonic anhydrase Increase decrease
Explanation / Answer
2. 20 ml of O2/ 100ml of blood 20 ml of O2 (provided by blood) * X (ratio) = 50 ml of O2 (required by brain) X=2.5 thus, 2.5 * 100 ml of blood = 250 ml ANSWER: 250ml of blood/min ***2.5 times the 20 ml of O2 is required to meet the brain consumption*** 3. a. Increase b. increase c. increase
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