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In biological systems gases move by diffusion and convection. What are these and when are they used?

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Patrina Schowalter
Patrina SchowalterLv2
28 Sep 2019

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Related questions

1. The cheetah, Acinonyx jubatus, is one of the fastest land mammals. Cheetahs spend much of their time resting, but can run at very high speeds when hunting. What changes can occur in the oxygen transport cascade to accommodate this increase in metabolic rate? Distinguish acute changes (with the onset of exercise) from chronic changes (or acclimatization to increased O2 demand in any mammal.

2. The oxygen transport cascade has two convective steps and two diffusive steps alternating. Which of the following reasons describes why convective movement of oxygen is needed?

a. Convection is the mass movement of fluid (both liquid and gaseous)

b. Convection typically covers three or four orders of magnitude more distance than diffusion

c. Diffusion is effective over distances up to 0.5 meters

d. Diffusion occurs through Brownian motion; diffusion of gas is down its partialpressure gradient

e.All of the above

TRUE OR FALSE? Correct the statement if it is false.

1.) A shallow concentration gradient limits the rate of facilitated diffusion

2.) Symport and antiport are coupled transport systems in which energy released by moving an ion from a region of high concentration to low concentration is used to move a solute against its concentration gradient

3.) Transport of siderophore-ion complexes into the cell requires the hydrolysis of PEP

4.) Both ABC transport and PTS transport are modular systems which ceoncentrate the substrate in the cell

name the four biomolecules and explain why they are important withing biological systems in 300 to 400 words

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