1. what is the difference between the trophozoite and cyst stages?
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Excystation produces a trophozoite from the cyst stage, and it takes place in the large intestine of the host after the cyst has been ingested. Cysts are smaller than trophozoites, measuring 40-60 mm across. Cysts are round and have a tough, heavy cyst wall made of one or two layers.
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['Stage 0: the Latency Stage. A subclinical state where swelling is not evident despite impaired lymph transport. ... ', 'Stage 1: Mild Stage. ... ', 'Stage 2: Moderate Stage. ... ', 'Stage 3: Lymphostatic Elephatiasis (Severe Stage)']
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Your ovaries normally grow cyst-like structures called follicles each month. Follicles produce the hormones estrogen and progesterone and release an egg when you ovulate. If a normal monthly follicle keeps growing, it's known as a functional cyst. There are two types of functional cysts: Follicular cyst.
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Sometimes the cyst can grow larger than the normal size which is up to 3 cm (a little over an inch). If the sac that holds the egg doesn't break open to release the egg, it can grow, anywhere in size from ½ inch (1cm) to 4 inches (10cm) across. Most follicular cysts will disappear in 2-8 weeks and do not cause pain.
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How do I tell the difference between frog, toad and newt spawn / tadpoles? Spawn is laid in clumps in shallower water. On hatching, tadpoles are black and will stick together in a writhing mass. As they develop, tadpoles become mottled/brown and do not shoal.
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The zygote is the initial stage in baby development. It is also known as a fertilized ovum formed from the union of the sperm cell and the egg cell. Foetus refers to the final stage in baby development. An embryo is termed as the foetus in the beginning in the 11th week of pregnancy.
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2.2. The first larval stage is the trochophore, which is covered by short cilia; in mussels and some other species it also has a flagellum.
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The fourth and final stage of a frog's life is an adult frog. Remember, the frog's life cycle has four stages. First the egg, second the tadpole, third the froglet and the fourth stage is the adult frog. Frogs and Butterflies each have four stages of their life cycles.
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These primordial follicles are transformed into primary oocytes in a process called oocytogenesis The main difference between secondary oocyte and ovum is that secondary oocyte is produced by the meiosis 1 of the primary oocyte whereas ovum is produced by the maturation of the ootid.
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The cyst is a vehicle; the source of concern are the cells within it. In waterborne cysts (also called microbial cyst), these cells often carry harmful protozoan parasites that can make people sick. The most common types of parasites found in waterborne cysts are Giardia and Cryptosporidium.
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Causes and risk factors Cysts may start to grow when a tube becomes blocked, swells up, and fills with fluid. Another possibility is that cysts start when pouches called diverticula form in weakened areas of the tubules and fill with fluid. You're more likely to have kidney cysts as you get older.
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Zygote is the stage that is succeeded by an embryo. The zygote comprises of a single cell whereas the embryo is multicellular as in this stage cell division has already commenced. The mitosis of the zygote results in to the formation of the embryo.
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The most common form of gestational trophoblastic disease (GTD) is a hydatidiform mole, also known as a molar pregnancy. It is made up of villi that have become swollen with fluid. The swollen villi grow in clusters that look like bunches of grapes.
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Like mitosis, meiosis also has distinct stages called prophase, metaphase, anaphase, and telophase. A key difference, however, is that during meiosis, each of these phases occurs twice — once during the first round of division, called meiosis I, and again during the second round of division, called meiosis II.
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Tusk shells feed upon such small organisms as protozoans of the order Forminifera and young bivalves. Sexes are separate, and the eggs develop into free-swimming trochophore larvae.
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Stage 4 (40 or more points) Stage 4 is the “severe” stage of endometriosis. In addition to many deep endometriosis implants, there are large cysts on at least one ovary and many dense adhesions throughout the pelvic region.
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If a cow (the intermediate host) feeds on contaminated vegetation, it ingests mature eggs or gravid proglottids. In the small intestine larvae called oncospheres hatch, penetrate the intestinal wall, enter the bloodstream and migrate to muscle tissue (rarely to liver or other organs), where they encyst into cysticerci.