Biology

Biology, 30.08.2019 19:30, tamya12234

What is the most efficient way to extract oxygen from the environment?
a. countercurrent
b. crosscurrent
c. uniform pool

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Chemistry, 25.06.2019 18:40, ethan0

We have a total feed of 100 kg/h to a countercurrent extraction column. the feed is 40 wt % acetic acid and 60 wt % water. we plan to extract the acetic acid with isopropyl ether. the entering isopropyl ether is pure and has a flow rate of 111.2 kg/h. we desire a raffinate that is 20 wt % acetic acid. a) find the acetic acid wt. fraction in the outlet extract stream b) determine the flow rates of the outlet raffinate and extract streams c) find the number of equilibrium contacts

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Biology, 16.07.2019 06:00, timothyallenhall2006

High-flying birds are able to obtain enough oxygen even when the air is very thin because a.they have more efficient lungs than other vertebrates. b.they have reduced amounts of hemoglobin in their blood. c.their mitochondria are more efficient than those of other vertebrates. and) their heart can increase or decrease in size as altitude changes. e.they are able to store oxygen in oxygen chambers within muscle cells.

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Biology, 17.08.2019 16:10, mercymain1014

In the kidneys, the countercurrent mechanism involves the interaction between the flow of filtrate through the loop of henle of the juxtamedullary nephrons (the countercurrent multiplier) and the flow of blood through the limbs of adjacent blood vessels (the countercurrent exchanger). this relationship establishes and maintains an osmotic gradient extending from the cortex through the depths of the medulla that allows the kidneys to vary urine concentration dramatically. (true/false)

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Biology, 07.10.2019 18:00, dae71

What is the difference between a countercurrent multiplier system, such as the one involving the loop of henle, and the countercurrent systems that maximize oxygen absorption by fish gills or reduce heat loss in endotherms?

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What is the most efficient way to extract oxygen from the environment?
a. countercurrent

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