7. What component of the molasses solution was osmotically active? Explain why t

Question

7. What component of the molasses solution was osmotically active? Explain why this is true. Test Your Analytical Ability 8. The receptors for thirst are located in a part of the brain called the hypothalamus. These receptors, called osmoreceptors anded on a desert island. Trace the course are stimulated by an increase in blood osmolality. Imagine a man who has just l of events leading to his sensation of thirst. Can he satisfy his thirst by drinking seawater? Explain. 9. Before the invention of refrigerators, pioneers preserved meat by salting it. Explain how meat can be preserved by this procedure. (Hint: Think about what salting the meat would do to decomposer organisms, such as bacteria and fungi.) 83

Explanation / Answer

8) No, he cannot satisfy his thirst by drinking sea water as it would increase his thirst. Sea water contains more salt content than normal freshwater and body concentration of salt is less than sea water. When he drinks sea water, solute concentration increases extracellularly and thus draws water out of the cell which results in dehydration.

9) In hypertonic solution, solute concentration is higher outside the cell so water move from the cell to outside solution. In hypotonic solution, solute concentration is higher inside the cell so water move from outside solution to the cell. Salting increases the solute concentration which creates hypertonic environment for decomposers like bacteria and fungi. Therefore, they cannot live or the cell shrinks in size.

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