Alveoli are structures that are:

A. important in digestion within the stomach
B. used in the production of urine by the kidneys
C. important in respiration within the lungs
D. within the red bone marrow producing leukocytes

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organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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