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Extra resources for Britannica Illustrated Science Library Human Body I
2. FILTRATION The blood is filtered in the nephrons, the functional units of the kidneys. PROXIMAL CONVOLUTED TUBULE First section of the filtrate's exit route Direction of Filtering EFFERENT ARTERIOLE Glomerulus salt GLOMERULUS Second stage, or ultrafiltrate PERITUBULAR CAPILLARIES The thinnest conduits 5 CORTEX RENAL VEIN The blood flows out of the kidney through the renal vein toward the vena cava, one of the principal veins of the body. BOWMAN'S CAPSULE First stage of the filtrate. It surrounds a fluid consisting of water, potassium, bicarbonate, sodium, glucose, amino acids, urea, and uric acid.
5 inches (4 cm). IN A MAN IN A WOMAN URETER 2 RENAL ARTERY brings the blood from the heart to the kidneys. INFERIOR VENA CAVA channels the blood that returns from the renal vein and the rest of the body to the heart. BLADDER URETER connects each kidney with the bladder. ABDOMINAL AORTA A section of the large circulatory canal. It provides blood to the renal artery. UTERUS URETER PROSTATE PENIS TESTICLE The urine passes from the renal pelvis to the ureter and then to the bladder, where it accumulates until it is eliminated through the tube-shaped urethra.
The other end terminates in a group of cilia, or microscopic hairs, which serve a protective function within the mucosa. OLFACTORY BULB NERVE FIBER The area of the brain that receives information from the tongue IMPULSES FROM THE GLOSSOPHARYNGEAL NERVE TRIGEMINAL NERVE IMPULSES OLFACTORY BULB Located behind the nose, it receives information directly from the nasal fossae. ETHMOID BONE OF THE CRANIUM RECEPTOR CELL SUPPORT CELL 10,000 RECEPTOR CELL CILIA THE NUMBER OF ODORS THE SENSE OF SMELL CAN DISTINGUISH SMELL MOLECULE 4 Flavors Gustatory Papillae THE SURFACE OF THE TONGUE CAN DISTINGUISH: SWEET, SALTY, SOUR, AND BITTER.