Germ layer

Is mouth bacteria good or bad then? Mouth bacteria is not all that bad for your oral health. Some healthy bacteria actually keep bad germs away. For example, Streptococcus salivarius (Streptoe-kock-us sal-liv-air-ee-us). It is a good bacteria. It prevents strep throat and other illnesses caused by an imbalanced mouth microbiota. The bad bacteria it blocks is called Streptococcus pyogenes(strep-toe-kock-us…

Within the head are the nucleus, condensed DNA containing 23 chromosomes, and the acrosome. The acrosome is located at the end of the head and is considered a modified lysozome containing digestive enzymes that are capable of breaking through the outer layer of an egg. The midpiece of the sperm contains mitochondria that produce the energy for the tail to move. The tail is a flagella composed of microtubules. The sole purpose of a sperm cell is to deliver its head to the egg. The female's egg…

marine and fresh waters (Myers, 2001a). They are multicellular, heterotrophic, invertebrates with an irregular shape and no distinct pattern of symmetry (Myers, 2001a). Overall, they are the simplest of animals; thus, lacking any true tissue and/or germ layers (Myers, 2001a). Furthermore, they are known to be highly sessile, and feed by collecting bacteria from the water that streams through their porous bodies (Myers, 2001a). Feeding is known to be distinct, as their flagellated cells called…

Their are different hormones that help in the process of pregnancy , which are called pregnancy hormones the main hormones heard about when pregnancy hormones are mentioned are HCG ( Human Chorionic gonadotropin) ,Progesterone , prolactin and estrogen . HCG is the hormone responsible for keeping the structure of where the embryo will develop at early stages (called corpus luteum) from being shed and absorbed back into the body.HCG also stimulates the secretion of progesterone and estrogen by…

for humans for many reasons. The mission to mars is dangerous for humans. First, The average temperature on mars is -61 degrees Fahrenheit which would be a physical con. Since the average temperature is below freezing we would have to wear multiple layers of clothing. For Instance, if any human wanted to go outside of their housing area they would have to have on enough clothing. Secondly, Mars is far away. Just getting there would take at least up to 10 months. Since the trip to mars is so…

It is so-called (ovary) germ cell tumors. The meaning of teras in Greek is a monster. Teratoma might occur in female and male reproductive systems because germ cells usually form the ova or eggs. It typically has three components that are endoderm, mesoderm, and ectoderm; these arise from totipotential cells (embryonic cells). Moreover, teratoma…

infected with the virus, for example by having sex or sharing needles to inject person. Pregnant women infected with HIV can also pass the virus to their babies during birth or through breast milk. HIV attacks the immune system so the body can not fight germs and diseases. A person infected with the virus in the body leads to the rest of his life. The human immunodeficiency virus is part of the genre Lentivirus.1 These constitute a group within the family Retroviridae.2 Viruses of this group…

“Guns, Germs, and Steel” which won a Pulitzer Prize. Diamond’s book and beliefs were that geography, the domestication of animals, immunity to germs, food production, and the use of steel were why societies were more successful than others and this book received much controversy among different scientists. Diamond traveled the world to peel back layers of the past to explore the very roots of power in the modern world. They are the biggest questions of human history on how have guns, germs, and…

testes. Epididymis is tightly coiled and has a comma-shaped. It consists of 3 regions; The head (superior portion), the body (midportion) and the tail (distal end). The epididymis consists of pseudostratified columnar epithelium, with is surrounded by layers of smooth muscle. It also has stereocilia, which is different from cilia. Functions; The epididymis stores and transports sperms. It is also site for sperm maturation. Ductus deferens (vas deferens) is a muscular duct that conveys sperm…

colonies. Patients suffering from CD have shown using fluorescent in situ hybridization (FISH) that commensal microflora closely contact the mucus layer that acts as one of the first lines of defense against pathogen invasion in the intestine and some are actually penetrating it (Haag et al. 2015). Petersson et al. showed that the thin colonic mucus layer of germ-free mice is restorable by introducing the lumen of the intestine to lipopolysaccharide (LPS) and peptidoglycan (PGN) of commensal…