Find and If

question 189

Essay

Find and if .

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Definitions:

Transmitting Substance

A chemical messenger that transmits signals across a chemical synapse, from one neuron (nerve cell) to another 'target' neuron, muscle cell, or gland cell.

Sound Waves

Vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.

Timbre

The quality of a musical note, sound, or tone that distinguishes different types of sound production, such as voices or musical instruments.

Pure Tones

Sounds with a sinusoidal waveform, meaning they have a single frequency and are perceived as a single pitch.