Developing sperm cells begin the process of meiosis they









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The blastula is produced by mitosis of the zygote, and is a ball of cells surrounding a fluid-filled cavity the blastocoel. There are four stages in mating. The heart doubles in size, and hormones stimulate sexual maturity. Early development compared in a sea urchin and frog. This class of STDs includes viral diseases that affect organ systems other than those of the reproductive system. Image from Purves et al. Home pregnancy tests work by detecting elevated hCG levels in the woman's urine.

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Human Reproductive Anatomy And

The bulbourethral gland secretes a mucus-like fluid that provides lubrication for intercourse. The three embryonic tissue layers form. During this trimester the fetus increases in size. In sexual reproduction new individuals are produced by the fusion of haploid gametes to form a diploid zygote. Once conditions improve, these eggs hatch into diploid individuals.

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When conditions deteriorate, rotifers will reproduce sexually and encase their zygotes inside a resistant shell. The ovarian cycle lasts usually 28 days. Only latex condoms prevent the spread of STDs. Images from Purves et al.

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Description: The hydra produces buds. starfish can regenerate an entire body from a fragment of the original body. Cleavage of the zygote begins while it is still in the oviduct, producing a solid ball of cells morula. Frog embryos divide to produce 37, cells in a little over 40 hours. Sperm and secretions make up semen. The uterus has an inner layer, the endometrium , in which a fertilized egg implants. Of the several hundred million sperm released in the ejaculation, only a few thousand reach the egg.
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