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What type of respiration does earthworm has? In many complex animals, the cells of internal organs are distant from the outside environment; respiratory systems provide the passage of gases to or from internal tissues. In such kind of systems, there is a difference in pressure of a specific gas on opposite sides of a membrane, the gas diffuses from the side of greater pressure to side of lesser pressure, or each gas is transported independently of other gases. For i.e., in tissues a carbon dioxide concentration is high or oxygen concentration is low as a product of active metabolism, oxygen diffuses into the carbon dioxide and tissue diffuses out.
In many lower animals, gas diffusion takes place through a moist surface membrane, as in flatworms; through the thin body wall, as in earthworms; through air ducts, or tracheae, as in insects; or through specialized tracheal gills, as in aquatic insect larvae. In the gills of fish the blood vessels are exposed directly to the external aquatic environment. Oxygen–carbon dioxide swap occurs between the surrounding water & the blood within the vessels; the blood carries gases to and from tissues.
What is folic acid? Why is the anemia caused by deficiency of folic acid known as megaloblastic anemia? The folic acid (when ionized it is known as folate) is a coenzyme that
Q. In which meiotic division does the separation of identical chromatids take place? And After the end of this process what are the ploidies of the new cells? The separation of
Using the words 'cilia' and 'mucus', describe, very briefly, how the body gets rid of dust which enters the lungs. The lining of the air passages makes mucus which traps dust p
What is Endocrine System explain ? The endocrine system consists of glands, organs that secrete hormones. Endocrine glands are tissues that produce secretions within the body,
Define Discovery of other Essential Nutrients? Following the identification of the food factors involved in beriberi, pellagra and scurvy, the search was on for other water-sol
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Protection of human health should be the primary consideration in risk management decisions. Decisions on acceptable levels of risk should be determined primarily by hum
Rhythmic fluctuations in the abundance and activity of cell-cycle control molecules pace the events of the cell cycle. • Kinase - a protein which activates or deactivates another
Define the uses of foams The foams frequently used in cookery are whipped cream, ice cream, cake, bread, meringues, milk froth and gelatin. Food foams contain large amounts of
nucleolus is formed by
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