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Atmosphere representation - nitrogen oxygen carbon dioxide water molecules - Category:Earth's atmosphere - Wikimedia Commons

Atmosphere representation - nitrogen oxygen carbon dioxide water molecules - Category:Earth's atmosphere - Wikimedia Commons

The placenta has many tasks: it transports oxygen, nutrients, and antibodies to the fetus by means of the umbilical vein; removes carbon dioxide and metabolic wastes from the fetus by the two umbilical arteries; serves as a protective barrier against harmful effects of certain drugs and microorganisms; acts as a partial barrier between the mother and fetus to prevent fetal and maternal blood from mixing; and produces hormones essential for maintaining the pregnancy. (The hormones are…

The placenta has many tasks: it transports oxygen, nutrients, and antibodies to the fetus by means of the umbilical vein; removes carbon dioxide and metabolic wastes from the fetus by the two umbilical arteries; serves as a protective barrier against harmful effects of certain drugs and microorganisms; acts as a partial barrier between the mother and fetus to prevent fetal and maternal blood from mixing; and produces hormones essential for maintaining the pregnancy. (The hormones are…

Aerobes are organisms that require oxygen in some form as a final electron and hydrogen acceptor during chemiosmosis/electron transport.  Obligate aerobes such as Bacillus subtilis, Staphylococcus epidermidis and Pseudomonas aeruginosa must have a supply of molecular oxygen, while microaerophiles such as Neisseria gonorrheae, N. sicca, N. meningitidis and Helicobacter pylori require oxygen in some other inorganic form like carbon dioxide.

Aerobes are organisms that require oxygen in some form as a final electron and hydrogen acceptor during chemiosmosis/electron transport. Obligate aerobes such as Bacillus subtilis, Staphylococcus epidermidis and Pseudomonas aeruginosa must have a supply of molecular oxygen, while microaerophiles such as Neisseria gonorrheae, N. sicca, N. meningitidis and Helicobacter pylori require oxygen in some other inorganic form like carbon dioxide.

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