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BPK 110 Chapter Notes - Chapter 11: Extracellular Fluid, Semipermeable Membrane, Osmoreceptor

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sapphiresnake846
19 Sep 2012
School
Simon Fraser University
Department
Biomedical Physio & Kines
Course
BPK 110
Professor
Leah Esplen

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Document Summary

Kin 110 chapter 11 water and major minerals. Only live a few days without water. Contains hydrogen bonds: bonds between hydrogen and oxygen atom. Electrolytes (ions): substances dissolved your body which can conduct electricity. Functions of water: heat capacity: the amount of energy required to raise 1 degree celcius, cooling ability, metabolism, ph balance, body fluids. Ions: atoms with an electrical charge: cations: positively charged ions, anions: negatively charged ions. 2/3 of body in intracellular fluids: potassium, main cation in intracellular. 1/3 of body in extracellular fluids: sodium, main cation in extracellular. Sodium-potassium pump: mechanisms that pump sodium ions out of a cell, allowing potassium ions to enter. Semipermeable membrane: membrane that allows some substances in, but others out. Osmosis: movement of water by concentration gradients, water flows across membrane to the side with a higher concentration to balance it: osmotic pressure: force which drives osmosis. 2. 7 litres for women: 3. 0 litres during pregnancy, 3. 8 litres during lactation.

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Related Questions

1.Approximately, what percent of your body is composed of water

2. How is water distributed between the extracellular and

intracellular fluid compartments?

3. Which main hormones are involved in fluid regulation?

4.Where is most of the sodium and potassium found inside of the body?

5. Which micronutrients are needed for blood cell formation & blood clotting?

Suppose I have a nerve fiber consisting of several axons allrunning in parallel to each other. When an action potential isgenerated in a certain axon, this will alter the concentration ofsodium and potassium ions inside the axon, and in the extracellularfluid around that axon.

The question is, will this change in ion concentration in theextracellular fluid, alter the threshold potential of an adjacentaxon, which shares the same extracellular fluid?

Animal cells often have more potassium ions (K+) inside the cells than in the extracellular fluid. Explain how those cells acquire potassium. State if energy was required to move the ion and the route of the ion into the cell.