sound

• human produce sound because of the small tube-like structure located on top of the trachea or windpipe
• this small tube-like is called the larnyx or human voice box
• there are two tissue bands that make up the vocal cords located inside the larnyx
• the air that you breathe in and out passes through the vocal cords and makes the cords vibrate. the vibrations are what you hear as sound
• sound waves travel fastest in solid
• sound waves travels fastest in solids because solids have compact particles which makes them good transmitters of sound
• sound waves travels slowest in gases
• sound waves travels slowest in gas because the particles of gas medium are far apart from each other
• sound reception are made possible by your ears
• sound reception starts at your outer ear
• the outer ear collects and directs the sound waves towards the middle ear
• located at your middle ear are your ear canal and eardrum
• when the sound waves hits your eardrum, your eardrum vibrates
• the vibrations from the eardrum are transmitted to three tiny bones: hammer, anvil, and stirrup
• three tiny bones or ear ossicles help increase the force that is then conveyed in terms of a pressure on the inner ear
• sound vibrations are transmitted through the spiral-shaped cochlea
• the vibrations are then converted to electrical signals through the nerve endings inside the cochlea
• the auditory nerves then carry these electrical signals through the brain, which produces the sensation of sound
• sound are classified as vocal when produced in the respiratory system
• mechanical sounds are produced by mutual contact of body parts or by contact with some component in the surroundings
• vocal sounds are restricted to vertebrate animals
• nonvocal sounds are produced by several invertebrates and some members of invertebrate classes