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

May 9th 2024

anthropometry

1. the scientific study of how the size and proportions of the human body are affected by such variables as age, sex, and ethnicity.

2. the taking of measurements of the human body for purposes of comparison and study. —anthropometric adj. —anthropometrist n.