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What are the valves of the venous system? What is their function?
The valves of the venous system are structures within the veins that permit blood to flow only in the normal way (from the tissues to the heart) and forbid it to return in the reverse way in favor of gravity. The valves close when the pressure of the fluid column above (after, regarding usual flux) is higher than the fluid pressure before them. Valves are therefore fundamental for the returning of blood to the heart.
how does a plasma membrane regulate movement of molecules into and out of a cell? is it polarity, integrity, permeability, or solubility? these are my choices
Q. What is the difference between spermatocyte II and spermatocyte I? The spermatocyte I (2n) undergoes the first division of meiosis (meiosis I) originating two spermatocyte I
Amphibia n - 3 chambered heart 2 auricles and 1 ventricle. Sinus venosus and truncus arteriosus (its main part is pylengium) present. Incomplete double circulation prese
What are the types of digestion and of digestive system of platyhelminthes? Flatworms have incomplete digestive systems and they show intracellular and extracellular complement
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
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When coal is heated strongly in absence of air, it forms a strong, porous, dense and coherent mass known as coke. This process of conversion of coal into coke is called carbonzatio
Why does DNA twist? If it did not twist, would you expect it to fit into the miniscule cell? As we all know, if we join all of the DNA molecules from a person's body end to en
What is the best microscope to get a detailed view of the parts inside of a preserved plant cell? Transmission electron microscope Scanning electron microscope Compound li
Which are the growth tissues of plants? How do they categorize and where can they be found? The growth tissues of the plants are the meristems. Meristems are the tissues that m
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