membrane

n. a thin layer of tissue that covers a surface, lines a cavity, or connects or divides anatomical spaces or organs. One of the fundamental functions of a membrane is to contain the components within it. In cells, the membrane surrounds the cytoplasm and is composed of proteins and lipids. It is semipermeable and acts to control the passage of substances in and out of the cell (see ion channel).

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Psychology term of the day

November 21st 2024

equal rights amendment (ERA)

Sorry, "equal-rights-amendment-era" is not in the Dictionary of Psychology. Please report to APA if you believe this is an error.