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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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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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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Critical Care Outline Chapter 66 * Critical care nursing: specialty dealing with human responses to life-threatening problems. * Critical care units (CCUs) or ICUs: designed to meet the special needs of acutely and critically ill pt’s. * Types of critical care: system based‚ medical‚ surgical‚ trauma‚ burns‚ age specific * Rapid response team (RRTs): provide for the delivery of advanced care by specialized teams usually composed of: * A critical care nurse * A respiratory
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Abstract: Osmosis is the transport of water across a selectively permeable membrane from a region of a higher water chemical potential to a region of lower water chemical potential. (Tzahi 2006) To demonstrate osmosis lab‚ artificial cells were made with various sucrose concentrations and were placed into beakers of different sucrose solutions. Overall the results showed that the higher percentage of concentration gradient of sucrose‚ the more the artificial cells absorbed. Introduction: The
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determining if there was a movement or not. 3.1B –Diffusion through semi-permeable membrane dialysis tube: In this second part‚ my team did an experiment to prove if there was movement inside and outside the dialysis tube. 3.2B-Osmosis in plant’s cells: In the last step of the experiment‚ we were observing two different samples of plant’s cells and determining
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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 prediction? Your answer: By increasing the extracellular K+ the membrane potential will change to be a less negative value. By adding more extracellular K+ the intracellular K+ will decrease and cause the membrane potential to become less negative. This result in a increased postitve membrane was what we predicted during the experiment. 3. Explain
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