Homeostasis is the maintenance of a steady state. With changes within and around living cells‚ conditions are maintained at a constant level. The ‘two major control systems‚ nerves and hormones‚ are mainly responsible for co-ordinating homeostatic mechanisms’ (Human Body) whilst using feedback. If a change in condition is detected a corrective mechanism is activated‚ conditions return to set point and the corrective mechanism is then switched off. The conditions are then at constant level. Some of
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Chapter 16: Endocrine System For this assignment‚ please read the chapter and answer the questions below. Please type your answers in red or blue color. Please note that points may be deducted if answers are not submitted in these colors. There is a tutorial on the endocrine glands in Blackboard under the Lab Tutorial button. Use it to study the glands. Under the External Links button The nervous and endocrine systems maintain homeostasis in the body. The nervous system is a fast but short-lived
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Kidney From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search For other uses‚ see Kidney (disambiguation). Kidney | | Human kidneys viewed from behind with spine removed | Latin | Ren (Greek: nephros) | Artery | renal artery | Vein | renal vein | Nerve | renal plexus | The kidneys are organs that serve several essential regulatory roles in most animals‚ including vertebrates and some invertebrates. They are essential in the urinary system and also serve homeostatic functions such
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Human Excretory System The human excretory system functions to remove waste from the human body. This system consists of specialized structures and capillary networks that assist in the excretory process. The human excretory system includes the kidney and its functional unit‚ the nephron. The excretory activity of the kidney is modulated by specialized hormones that regulate the amount of absorption within the nephron. Kidneys 1 ). They are bean-shaped organs located on either side of the backbone
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Give an account of nitrogenous excretion in mammals. Excretion plays an important part in the process by which the internal environment is regulated to maintain homoeostasis. It is the elimination of the unwanted products of metabolism and of substances present in excess within the organism. Animals excrete nitrogenous waste products such as ammonia‚ uric acid or urea. These or similar products to that produced by the deamination of any excess protein that has been eaten as nitrogenous compounds
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Ethanol sensitivity in Drosophila melanogaster based on genotype Alexa Shumate Department of Biology Randolph-Macon College Ashland‚ Virginia Introduction With a better understanding of the genes and behaviors associated with ethanol sensitivity‚ there will be new treatments available for alcohol dependence. The main problem in determining what causes dependence to alcohol is whether it is an environmental factor or if it is the genes associated with ethanol
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Regulation of distal organs such as the adrenal cortex. Anatomy Circle of Willis‚ above it is the hypothalamus; pituitary and pituitary stalk on either side of the 3rd ventricle. Pituitary is within the bony socket‚ at the base of the stalk. Salatarcica with the pituitary stalk passing down Cingulate gyrus and sulcus Fornix which comes out of the hippocampus Intraventricular foramen – in front of the thalamus and behind the fornix‚ through which CSF can pass through the ventricles. Aqueduct
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Mark scheme June 2002 GCE Biology B Unit BYB4 Copyright © 2002 AQA and its licensors. All rights reserved. The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales 3644723 and a registered charity number 1073334 Registered address: Addleshaw Booth & Co.‚ Sovereign House‚ PO Box 8‚ Sovereign Street‚ Leeds LS1 1HQ Kathleen Tattersall: Director General klm SECTION A Question 1 (a) GCE: Biology B – BYB4 June 2002 X = grana/lamellae/thylakoid
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THALAMUS and HYPOTHALAMUS ------------------------------------------------- February 14‚ 2011 DIENCEPHALON Gross Features * No structure visible on the surface of the brain except the inferior surface. * Inferior surface is the only area exposed to the surface in the intact brain. Extends from: * Anterior: Interventricular foramina * Posterior: Cerebral aqueduct Boundaries: * Superior: * Lateral ventricle * Corpus callosum * Septum pellucidum * Fornix * Lateral:
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Osmosis Experiment Dennis M. Feliciano Grand Canyon University BIO100L Biology Concepts Lab June 25‚ 2011 Osmosis Experiment Materials Grapes (unblemished) Raisins (larger is better) Water Salt Four small containers (i.e.‚ drinking cups or clear glasses) A metric ruler Methods and Procedure Place 1 cup (236 ml) of water in each of the 4 containers. In 2 of the containers‚ add 1 tablespoon (14.8 ml) of table salt and mix well. Measure the length and width of a raisin and place
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