ACTIVITY 1: THE RESTING MEMBRANE POTENTIAL 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out the neuron through the K+ leak channels? When the diffusion is greater on one side‚ the other side will slow down. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your predictions? There are two potassium’s for every sodium so the increase of potassium will make it more
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Shadish‚ Rob Harris‚ Patricia Tellekamp Water appears to cross the differentially permeable membrane of potato cells by a process called osmosis. The measure of the energy involved in osmosis is called water potential. Since water must lose energy as it moves by osmosis‚ water must move from an area of greater potential to an area of less water potential‚ until the water potential on either side of the membrane is the same‚ at which point the cell has reached equilibrium. The two major parameters influencing
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total testosterone may be warranted in the clinical decision-making of this patient. Free testosterone has been estimated from the serum for some time by dialyzing serum across a semipermeable membrane with the testosterone that crosses in the serum believed to be the unbound portion or free. Most dialysis assays use small tracer amounts of radiolabeled testosterone added to the serum.
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Eddy Current 1. The principles of eddy current testing depend on the process of electromagnetic induction. 2. This process includes a test coil through which vary or alternating current (AC) is passed. 3. A varying current flowing in a test coil produces a varying electromagnetic field around the coil‚ As shown in this diagram Amperage * # of coils= strength of magnetic field 4. The electromagnetic field produced around the coils is directly proportional
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Mechanisms of Acetaminophen-lnduced Liver Necrosis By Jack A. Hinson‚ Dean W. Roberts‚ and Laura P. James Acetaminophen (paracetamol‚ N-acetyl-p-aminophenol; APAP) is widely used as analgesic and antipyretic drug. At therapeutic doses‚ acetaminophen is safe to be used. Acetaminophen other than aspirin and ibuprofen has only weak anti-inflammatory properties. At higher doses‚ acetaminophen produces a centrilobular hepatic necrosis that can be fatal. Acetaminophen-lnduced Hepatotoxicity Observation/
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in and out of the cell. The movement of substances in and out of a cell through the cell membrane is termed as transport across the membrane. Although the thickness of the cell membrane is only 5-10nm‚ it is a physical barrier to the movement of ions and molecules. The cell membrane and other membranes within a cell are all living membranes that exhibit selective permeability. A selectively permeable membrane enables molecules of certain substances to move across it freely while excluding others
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Chronic renal failure is a worldwide public health problem. Millions of Americans are affected by this disease each year. It is a common condition in which there is progressive loss of kidney functioning. The loss of function usually takes months or years to occur‚ sometime not appearing until kidney function is less than one-tenth of normal. The kidneys have the important job of filtering‚ wastes and excess fluids from your blood‚ which are then excreted in the urine (Huether‚ 2012). When the kidneys
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about nutrient absorption by the intestinal mucosal cells is true? a. Carbohydrates are absorbed as disaccharides. b. Fats are absorbed as fatty acids and monoglycerides. c. Amino acids move across the plasma membrane only by diffusion. d. Bile transports fats across the plasma membrane. e. Most nutrients are absorbed in the duodenum. 4. Microbial fermentation in the gut of a cow a. produces fatty acids as a major nutrient for the cow. b. occurs in specialized regions of the small intestine
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The cell membrane is a semipermeable membrane made to separate the interior of the cell from the exterior and regulate the movement of substances in and out of the cell. Diffusion is how substances more in and out of the cell. There are several types of diffusion‚ but for the purposes of this lab‚ we will be focused on simple and osmosis. Simple diffusion and osmosis are vital for the diffusion of water and maintaining homeostasis. Homeostasis is the ability to maintain equilibrium and keep the organism
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Gabriela Rios-Martinez March 1‚ 2014 BIO 141 Exam 1 Study Questions Chapter 1: Biology and the Tree of Life (#1 – 4) 1. What is the difference between a hypothesis and a scientific Theory? Between a hypothesis and a prediction? What kinds of hypotheses are useful for scientific investigations that try to explain the natural world‚ and which are not? Give one or more examples of hypotheses that are and are not scientifically useful. (a.) A scientific theory has two components; a pattern
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