« Ilya Rabkin Osmolarity and Body Volume Introduction Our bodies and many other animals' cells extracellular and intracellular fluids are mainly comprised of ...» Document abstract
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02/10/2007
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SummaryOur bodies and many other animals’ cells extracellular and intracellular fluids are mainly comprised of water with ionized salts in solution. These salts, mainly Na+, K+, Cl-, Ca2+, and Mg2+ ( Foundations Of Biology: Cell and Organ Physiology, Faculty of the Department of Neurobiology and Behavior SUNY Stony Brook; Pacific Crest 2007, Lisle IL: pg 9) can appear in an organism in different times in varying amounts. Animals, including humans regulate the different concentrations of salt in their bodies versus the environment through osmosis, which is the movement of water molecules across a semipermeable membrane from a region of low solute potential to an area of high solute potential ( Wikipedia, the Free Encyclopedia, Wikimedia Foundation, Inc. Osmosis. http://en.wikipedia.org/wiki/Osmosis. Viewed 02/14/07).
Table of Contents
- Introduction
- Our bodies and many other animals' cells extracellular and intracellular fluids are mainly comprised of water with ionized salts in solution.
- In this experiment, we used two organisms, Nereis virens, a worm which are usually found on floor of a shallow body of water, usually salt water.
- The worm on the other hand has no mechanism to regulate salinity, so when placed in a hypo osmotic environment the worms` cell would intake water and gain volume and not be able to release any, changing its internal salinity.
- Methods
- In our experiment we weren't able to obtain Nereis virens so there for preparing two watch glasses for each salinity was not needed
- The 500 ml was then split up between two groups running similar experiments, so that each watch glass still had 250 ml with the proper salt concentrations.
- Results
- Our results show, as seen in Figure 5, that at a 75% salt solution the clams have a slight decrease in weight while the worms have a significant increase in their weight.
- Discussion
- The experiment with the clams was conducted by us; however other problems might have contributed to the data.
« kidneys. . Mike Goikhberg 2/12/07 Osmolarity and Body Volume Introduction Water comprises a very large part of an organism's body. The ...» Document abstract
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Language : english
medical studies
case study
date published
23/10/2007
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SummaryWater comprises a very large part of an organism’s body. The delicate balances within the systems of an organism involve the concentrations of, to name a few, Na+, K+, Cl-, and Ca2+ salts (Dilger and Collins, p. 9). There are two types of fluids within organisms; the ICF (intracellular fluid) and ECF (Extracellular fluids). Every organism regulates the tonicity of the ICF. However, the ECF can be regulated or non-regulated. Organisms fall into two categories based on this distinction. These categories are the osmoconformers and the osmoregulators (Dilger and Collins, p.9). Osmoregulators have special mechanisms to keep their BFOC (Body fluid osmotic concentration) constant, independent of the EOC (environmental osmotic concentration). Osmoconformers, on the other hand, have a BFOC that is directly related to the EOC ( Dilger and Collins, p.9).
Table of Contents
- The two organisms that we studied in the lab were the sand worms Nereis sp. and the hard clams, Mercenaria mercenaria.
- To carry out this experiment, we used three different concentrations of artificial salt water using a mixture of 'Instant Ocean' and water.
- The worms weight change shows that in a less salty solution, they gain weight.
- At the conclusion of this lab, there are some confirmations of the hypothesis and some discrepancies.
- In general, organisms could use other osmoregulating devices such as protonephridia, metanephridia, malphighian tubules, and the kidneys.
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