Outer

Sound waves are funneled by the pinna, or auricle, into the external auditory meatus (fig. 10.17). These two structures form the outer ear. The external auditory meatus channels the sound waves (while increasing their intensity) to the eardrum, or tympanic membrane. Sound waves in the external auditory meatus produce extremely small vibrations of the tympanic membrane; movements of the eardrum during speech (with an average sound intensity of 60 dB) are estimated to be about the diameter of a molecule of hydrogen!

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Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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