The answer is "because water is produced as a by-product"...the word dehydration should also be a major clue because that means water loss.
Answer:
Muscle fatigue is often reported by patients with Marfan syndrome although myopathy is not classically considered a component of Marfan syndrome [1, 2, 4, 6, 7]. In addition to apparent muscle underdevelopment, some patients report myalgia or cramps suggesting skeletal muscle involvement.
Red Blood Cells would take up 41% of the blood's overall volume.