Science Studies

Britannica Illustrated Science Library Human Body I by Inc. Encyclopaedia Britannica

By Inc. Encyclopaedia Britannica

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The filtered blood, free from waste, is sent to the renal vein and reenters the bloodstream. 4. URINE 1 million 5. CLEAN BLOOD 1 ONE KIDNEY HAS ABOUT ONE MILLION NEPHRONS. 45 minutes RENAL CAPSULE Protective layer that covers each kidney. It consists of white fibrous tissue. 41 to 51 fluid ounces (1,200 to 1,500 cc) IS THE AMOUNT OF URINE ELIMINATED EACH DAY BY AN ADULT. RENAL ARTERY A branch of the aortic artery, which provides the kidney with blood INTERLOBULAR ARTERY Section of the medulla INTERLOBULAR VEIN Section in the medulla COLLECTING TUBULE Transports and concentrates the filtered liquid from the nephrons.

ROOT Entirely buried in the maxillary bone TONGUE Its notable flexibility makes eating possible. It also tastes the food. CEMENT The thin layer that covers the roots and anchors them in the jawbone PHARYNX The muscles in the walls of the pharynx contract, forcing the bolus of chewed food into the esophagus. ESOPHAGUS Its muscles force the bolus toward the stomach. The esophagus and stomach are separated by a sphincter. ENAMEL has no feeling and is the hardest substance in the body. DENTIN Sensitive to cold and heat, it is stronger than bone tissue.

These vibrations produce waves in the fluid, which stimulate the cilia of the organ of Corti. The cochlea allows differences in volume to be identified. HAMMER Transmits the eardrum's vibrations. 3 inch (8 mm) long. ANVIL Receives the hammer's vibrations 3 INNER EAR AURICULAR PAVILION or pavilion of the ear. The only visible part of the ear. It consists of cartilage and skin. It captures the sound vibrations and redirects them into the ear, preventing echo. Organ of Corti 2 Inclined Filaments VESTIBULAR APPARATUS FROM THE OUTSIDE ENTRANCE The sound wave is captured by the ear and enters via the auditory canal.

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