Jake Roy

Biology

25 August, 12:27

During a hot August a football player weighing 100 kg has lost 5 L of sweat. His Hct before the workout was 45% and rbc count was 5 x 106 mm-3. During the workout he drank 1.5 L of water which has been absorbed into the blood from the GI tract. Assume that the blood mass is 8% of his body mass and that the density of blood is 1.05 g cm-3. Further assume that the fluids lost from his body were distributed proportionately from the extracellular volume and intracellular volume, which make up 20% and 40% of the body mass, respectively (assume the density of the fluids is 1.0 g cm-3).

A. How much volume did he lose?

B. How much of the lost volume came from the extracellular fluid com partment? How much from the intracellular volume?

C. What was the MCV (mean cell volume) before the workout?

D. What is the MCV after the workout? (The red blood cell has an intracellular volume)

E. What is the hematocrit after the workout?