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Bio 6th vid 1

QuestionAnswer
What is a selectively permeable membrane? Selectively permeable membrane allows some but not all substances to pass through.
What is an advantage of having a selectively permeable membrane? Only certain substances are let in or out of cell. E.g Water, oxygen and carbon dioxide can pass through. Proteins, sugar and salts do not pass through freely.
What cell components contain membranes and are selectively permeable? Cell membrane, Mitochondria membrane, Chloroplast membrane and Nucleus membrane
What is diffusion? Diffusion is when molecules move from an area of high concentration to an area of low concentration. Diffusion is a passive process (does not require energy)
Example of diffusion in the lungs Oxygen diffuses from the alveoli (lungs) into the capillary. Carbon dioxide and water vapour diffuses from capillary into the alveoli (lungs).
Other examples of diffusion in humans Glucose diffuses into the blood from intestines
Name two substances that enter muscle cells from the blood by diffusion Glucose/oxygen
Example of diffusion in the leaf Carbon dioxide diffuses from the atmosphere and into the leaf through the stomata. Oxygen diffuses from the leaf into the atmosphere.
Created by: Louie Masterson
 

 



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