By Inc. Encyclopaedia Britannica
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Extra resources for Britannica Illustrated Science Library Human Body I
RENAL PELVIS transports the urine to the ureter. RENAL PYRAMID A fluted structure in the form of a pyramid, located in the renal medulla 2 NEPHRON A grouping of vessels and capillaries in the kidney's cortex, or sheath. Most of the filtering done by the nephrons takes place there. The wide, afferent arterioles bring blood to the glomerulus. Other, narrower, efferent arterioles lead out of the glomerulus, transporting blood. Inside the glomerulus so much pressure is generated that substances in the blood pass out through the porous capillary walls.
OVULATION CORPUS LUTEUM EMPTY FOLLICLE The luteinizing hormone (LH) triggers ovulation on day 14 of the cycle. LH The empty follicle (the ovum has already been expelled) is converted into a corpus luteum, which produces progesterone to thicken the endometrium (uterine lining) and receive the ovum if fertilized. Cilia, tiny hairlike structures, move the ova very smoothly. PROGESTERONE OVARY Contains follicles of the ova, one of which matures during each menstrual cycle FIMBRIAE Filamentary formations that guide the released ovum toward the fallopian tube during ovulation Within the Ovary At the Hormonal Level The 28 Days of the Menstrual Cycle PITUITARY GLAND As the estrogen level increases, the blood vessels expand.
LENS RETINA IMAGE 1 The left eye perceives an object at an angle of 45°. HYPEROPIA (FARSIGHTEDNESS) Retina CORNEA When the eyes look ahead, the field of vision is binocular because both eyes see at the same time, each one from a different perspective. The images are superimposed at an angle of Retina CILIARY BODY OPTIC DISK LENS Its function is to focus and construct the image. LIGHT The rays cross inside the eye. VISION PROBLEMS The most common problems involve seeing things out of focus. These are hypermetropia and myopia.