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Yogita Ingle 6 years, 10 months ago
Brown algae have a colloidal covering over their cellulosic cell wall, consisting of a mixture of polysaccharides collectively called phycocolloids. e.g., alginic acid (algin), fucoidin and fucin. These prevents drying or freezing (in water), when algae are exposed to air during low tides and protect cells when waves beat them against the rocks.
Posted by Ashish Singh 6 years, 11 months ago
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Posted by Sabba Ansari 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
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Identification of differences among organisms and placing them into groups that reflect their most significant features and relationship is called biological classification.
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Biological classification was first proposed by Aristotle who divided plants into herbs, shrubs and trees. Animals were classified into with RBC’s and without RBC’s.
Posted by Ashish Singh 6 years, 11 months ago
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Posted by Black Pink 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
The volume of air remaining in the lungs after a normal expiration is known as functional residual capacity (FRC). It includes expiratory reserve volume (ERV) and residual volume (RV). ERV is the maximum volume of air that can be exhaled after a normal expiration. It is about 1000 mL to 1500 mL. RV is the volume of air remaining in the lungs after maximum expiration. It is about 1100 mL to 1500 mL.
∴FRC = ERV + RV
≅ 1500 + 1500
≅ 3000 mL
Functional residual capacity of the human lungs is about 2500 – 3000 mL.
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Meghna Thapar 5 years, 7 months ago
During systole, the aortic and pulmonic valves open to permit ejection into the aorta and pulmonary artery. The atrioventricular valves are closed during systole, therefore no blood is entering the ventricles; however, blood continues to enter the atria through the vena cavae and pulmonary veins. The semilunar valves act in concert with the AV valves to direct blood flow through the heart. When the atrioventricular valves are open, the semi lunar valves are shut and blood is forced into the ventricles. When the AV valves shut, the semilunar valves open, forcing blood into the aorta and pulmonary artery.
Posted by Riya Kausha 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
Platyhelminthes very commonly known as flatworms or tapeworms, these animals are soft-bodied invertebrate animals. There are around 20,000 species of these animals. A few of these live as parasites on humans and other animals. It is because of this parasitic nature that they do cause some amount of trouble for the host animal. A few species belonging to this phylum can be a major cause of certain diseases. Schistosomiasis, or bilharzia or bilharziasis, is a disease caused by these parasitic flatworms belonging to the family Schistosomatidae.
Posted by Prabhat Bolia 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
The nucleus also called director of the cell. It is the most important part of the cell which directs and controls all the cellular function.
Discovery : The nucleus was first observed by Robert Brown (1831), in orchid root cells. Nucleus plays determinative (in heredity) role in cell and organism, that was experimentally demonstrated by Hammerling (1934) in surgical experiments with green marine unicelled algae Acetabularia.
Posted by Geetika Sharma 6 years, 11 months ago
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Posted by Shivam Kumar 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
Exchange of gases:
(a) Exchange of gases in lungs: It is also called external respiration. In this gaseous exchange oxygen passes from alveoli to pulmonary capillary blood and CO2. Comes to alveoli from pulmonary capillary.
(2) Release of CO2 by the blood: The PCO2 (partial pressure of carbon dioxide) of blood reaching the alveolar capillaries is higher than the PCO2 of alveolar air. Therefore, carbon dioxide diffuses from the blood of alveolar capillaries into the alveolar air.
(b) Exchange of gases in tissues: In the tissues, exchange of gases occurs between the blood and the tissue cells. This exchange occurs via tissue fluid that bathes the tissue cells. The blood reaching the tissue capillaries has PO2 higher than that in the tissue cells and PCO2 lower than that in the tissue cells.
Posted by Raj Pratap 6 years, 11 months ago
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Yogita Ingle 6 years, 11 months ago
Phagocytosis is the process of digestion of solid substances by cells. In this process, the cell surrounds the particle and engulfs it. The foreign particle is destroyed and its contents broken down. This process is used for ingestion or for destroying the foreign particle or pathogen.
Posted by Gopi Raina 6 years, 11 months ago
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Japisher Singh 6 years, 10 months ago
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