Pore

From Encyclopedia Jr, free information reference for Kids

A pore, in general, is some form of opening, usually very small.

In biology:

• For skin, a pore is an opening into a sebaceous gland that secretes oil to lubricate and protect the surface of the skin
• In plants, pores, or stoma, exist in leaves in order to aid in photosynthesis and respiration
• Other organic substances are porous, and they can be very light, such as wood and the bones of some birds

In cell biology:

• Pores called aquaporins are used to facilitate the movement of water in and out of cells by means of osmosis
• Ion channels contain pores to allow ions to pass through the cell's plasma membrane into or out of the cell

In earth sciences:

• The measure of pores in a rock or unconsolidated material is porosity
• Pores are also referred to as void spaces, or voids

[edit] See also

• Nuclear pore
• Acne
• Bacne
• Keratosis pilaris

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