hich will diffuse faster, ammonia or carbon-dioxide? What are their relative rates of diffusion.

Which of the following gases has the lowerst rate of diffusion under the same conditions of temperature and pressure? [H = 1, O = 16, Ne = 20, CI = 35]A. ChlorineB. HydrogenC. NeonD. Oxygen

What is diffusion?The passive movement of particles from a high concentration to a low concentrationThe passive movement of particles from a low concentration to a high concentrationThe active movement of particles using energy from respirationThe passive movement of water though a semi-permeable membrane from an area of high concentration to an area of low concentration2Which of the following factors do not speed up diffusion?Small surface area to volume ratioIncrease in temperatureIncrease in concentration gradientLarge surface area to volume ratio3During ventilation, in which order does air enter the following structures to reach the lungs?Bronchi, bronchiole, trachea, alveoliTrachea, alveoli, bronchi, bronchioleTrachea, bronchi, bronchiole, alveoliBronchi, trachea, bronchiole, alveoli4Which one of the following characteristics would you expect to find in alveoli to make them efficient at gas exchange?Small surface areaRich supply of blood capillariesLong diffusion distanceThick walls5Which two mechanisms are important for maintaining the steep concentration gradients of oxygen and carbon dioxide that are necessary for gas exchange?Respiration and ventilationVentilation and circulationVentilation and excretionRespiration and circulation6During gas exchange:Oxygen moves down a concentration gradient from the air in the alveoli to the bloodOxygen moves down a concentration gradient from the blood to the air in the alveoliOxygen moves up a concentration gradient from the blood to the air in the alveoliOxygen moves up a concentration gradient from the air in the alveoli to the blood

Which variables affect the rate of diffusion? Check all that apply.Check All That ApplySolubility of moleculesSolubility of moleculesSize of moleculesSize of moleculesConcentration gradientConcentration gradientPolarity of molecules

1. Describe two variables that affect the rate of diffusion. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? __________________________________________________________________________________________________ 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. __________________________________________________________________________________________________ __________________________________________________________________________________________________ Simulated Facilitated Diffusion 1. Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. Explain your prediction for the effect Na+Cl- might have on glucose transport. In other words, explain why you picked the choice that you did. How well did the results compare with your prediction? __________________________________________________________________________________________________ Simulating Osmotic Pressure 1. Explain the effect that increasing the Na+Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. Solutes are sometimes measured in milliosmoles. Explain the statement, "Water chases milliosmoles"

Ratio of rate of diffusion of H2 and O2 under identical condition of temperature and pressure will be