Muscle Cell at rest: As the muscle cell is at rest it has a resting potential of -90mV. The K+ is all located inside the cell‚ the Na+ is located outside of the cell and the Ca2+ is located inside the sarcoplasmic reticulum. All leak channels and pumps are closed at this point. Muscle Cell stimulated by Acetylcholine: A motor neuron releases Acetylcholine which diffuses toward the muscle cell across the neuromuscular junction. As the Acetylcholine binds to a receptor on the muscle
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Water has many unique properties that make life possible on Earth. One property is cohesion. The cohesion property is properly defined as the binding of water molecules by hydrogen bonds. Water has this property as a result of the chemical bonding between water. Cohesion of the strong hydrogen bonds allows the water molecules to stick together‚ almost as a unit of one. A force exerted on one of the molecules will be exerted on all of the adjacent molecules as a result of cohesion. Cohesion‚ often
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Lab Report Title: * Color reaction of starch when mixed with Iodine solution Introduction: Statement: * How would the varying solutions react when introduced with the Iodine solution? Hypothesis: * If a solution is rich in starch then it will react with iodine solution and change to a bluish-black color (looks Brown) Materials: Items: * 8 test tubes‚ pipet‚ iodine‚ onion juice‚ potato juice‚ sucrose solution‚ glucose solution‚ distilled water‚ fructose solution‚ starch solution
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FRQ #3 a.) The first property of water is its polarity. A water molecule is formed by one oxygen atom covalently bonded to two hydrogen atoms. The electronegativity of the oxygen atom creates an unequal sharing of electrons between the O and H atoms of the molecule. This also gives water the ability to form hydrogen bonds between the slightly negative oxygen atom and the slightly positive hydrogen atom. Water has a high specific heat due to the hydrogen bonds. Because of this‚ water requires
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Adriana Gutierrez AP Biology Lab 9 Analysis 1. For this experiment‚ what were the independent variable and the dependent variable? What were the constants? The independent variable of this experiment are the environmental factors that you are testing on the rate of transpiration‚ so our independent variables would be bright light‚ fan‚ dark‚ and misted. The dependent variable is the rate of transportation because this depends on whatever environmental factor the plant is placed. The constants
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Chapter 3 Molecules of Life I. Carbon 1. 6 electrons- (4 valence) has the ability to bond with 4 other elements 2. Hydrocarbons- (contains only C & H) 3. Asymmetric carbon- attached to 4 different atoms or groups of atoms II. Isomers - Compounds having the same molecular formula but different structure and properties 1. Structural- differ in covalent arrangement of their atoms and may differ in location of double bonds 2. Geometric- same structure different arrangement 3. Enantiomer/stereoisomer
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Chapter 23 Inference About Means Copyright © 2010 Pearson Education‚ Inc. Getting Started n n n Now that we know how to create confidence intervals and test hypotheses about proportions‚ it’d be nice to be able to do the same for means. Just as we did before‚ we will base both our confidence interval and our hypothesis test on the sampling distribution model. The Central Limit Theorem told us that the sampling distribution model for means is Normal s with mean μ and standard deviation
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of well known environmental contaminants‚ such as dioxin‚ PCBs and DDT‚ can affect hormone levels. Hormones are produced by the endocrine system as regulators of biological function in target organs. Because hormones play a critical role in early development‚ toxicological effects on the endocrine system often have an impact on the reproductive system. The term endocrine disruptor is used to describe chemicals that can mimic hormones and may either enhance or counteract their effects. It has been
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Section: Bio 202 labpaq rep 01 LAB REPORT: ENDOCRINE SYSTEM You must get all parts of the question correct to get credit for the question Step 1 (Can be observed on the following slides‚ either from your lab kit or from the Labpaq web site (http://www.labpaq.com/ex-1-endocrine-system)). List the following: · Location in the body of the following structures · Slide #/location observed · One hormone secreted by each Please pay special attention to properties like shapes‚ sizes
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Unit 10. Assignment 2. The Endocrine System: Diseases and Age-Related Changes Cushing Syndrome Cushing Syndrome is a condition that presents itself due to the endocrine system. The endocrine system is responsible for secretion of hormones. Cushing syndrome comes about when the body has excess levels of a hormone called cortisol in the body. Cortisol is very important. It plays a role in managing blood pressure and keeps the cardiovascular system functioning normally. Cortisol also aids the body
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