The following questions ask students to become familiar with numbers associated
ID: 277600 • Letter: T
Question
The following questions ask students to become familiar with numbers associated with respiration.
A)How low in oxygen (partial pressure) is venous blood as it returns to the heart after having gone through organs like muscle while you are sitting in class?
B) How much oxygen is present in venous blood as it returns to the heart terms of real content (ml oxygen per 100 ml of blood?
C) How much oxygen has been released to the tissues (ml oxygen per 100 ml of blood?
D) While vigorously exercising, what would be the approximate total amount of oxygen released to your tissues?
E) What would the partial pressure for oxygen be expected to be in the blood coming to the lungs for re-oxygenation during vigorous exercise?
Explanation / Answer
Answer (A)
The partial pressure of Oxygen in arteries is 100 mm Hg when it travels from heart to various parts of the body. when it returns to the heart through veins the Partial pressure of Oxygen becomes 40 mm Hg. so the difference in partial pressure is 60 mm Hg.
Answer (B)
Content of oxygen in veins CvO2 = ( SvO2 x Hb x 1.34 ) + ( PvO2 x 0.003)
it is normally 15 ml/ 100ml of blood.
Answer (C)
The Oxygen content of atrial blood is approximately 20 ml/100 ml of blood ( 19.4 ml as oxyhemoglobin + 0.3 ml in plasma ) and oxygen in veinal blood is 15 ml/100 ml of blood so , released oxygen will be 20- 15 = 5 ml/ 100 ml.
Answer (D)
the normal oxygen extration is 25% of oxygen present in the blood, but it increases to 70-80 % during vigorous exercise that is 16 ml/100ml of blood.
Answer (E)
During vigorous exercise the partial pressure of xygen in lungs become halved from 40 mm Hg to 20 mm Hg.
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