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?

You decide that the introduction should also discuss the extremophiles that are referred to as the archaea. these single-cell organisms are considered "extremophiles" due to their ability to survive and reproduce in environmental conditions that would be hostile for most living organisms. archaea species have been isolated from highly acidic sulfur springs, ocean floor thermal vents with temperatures that exceed boiling, and subarctic ice well below freezing. while still considered to be prokaryotic, the archaea have numerous differences that place them apart from the bacteria. choose the characteristics that separate the archaea from other prokaryotic cells. select all that apply. view available hint(s) select all that apply. archaea lack true peptidoglycan in their cell walls. the morphology of the cell is rigid and is geometric in shape, similar to a sphere or cylinder. the cytoplasmic membrane lipids of archaea have branched or ringform hydrocarbon chains. all currently identified and characterized archaea have been linked as the causative agent to an animal or human disease.

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?