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secondary oocyte, an oocyte in the period between the first and second maturation division. It is derived from a primary oocyte shortly before ovulation by a division that splits off the first polar body. If fertilized, it divides into an ootid and the second polar body.Otherwise, it perishes.In humans, it is a round cell about 0.1 mm in diameter and consists of protoplasm that contains some yolk enclosed by a thin cell wall, the vitelline membrane. It is surrounded by the zona pellucida and corona radiata.f fertilized, it divides into an ootid and the second polar body. Otherwise, it perishes. In humans, it is a round cell about 0.1 mm in diameter and consists of protoplasm that contains some yolk enclosed by a thin cell wall, the vitelline membrane. It is surrounded by the zona pellucida and corona radiata.
How the Urinary System Works. The urinary system is made up of the adrenal glands, renal arteries, the kidneys, aorta, ureters, common iliac arteries, urinary bladder, urethra, and in men, the prostate. As food enters the body, various cells break it down into energy.ext, the ureters transport the urine to the urinary bladder. The bladder then expands to accommodate the extra fluid. When it stretches to its limit, urine is then sent to the urethra and out of the body. In men, urine also passes through the prostrate before it is released.