Physiology Exam 1 (answers) Rated 100%!!!

True - ANS Positive feedback mechanisms tend to increase the original stimulus. (t/f) True - ANS Without some sort of negative feedback mechanism, it would be impossible to keep our body chemistry in balance. (t/f) True - ANS Regardless of the variable being replaced, all homeostatic control mechanisms have at least three interdependent components. (t/f) Control Center - ANS If you consider your home air conditioner in terms of homeostasis, then the wall thermostat would be considered the? To Maintain Homeostasis - ANS What is the main, general purpose of negative feedback? Organ - ANS A structure that is composed of two or more tissues Lipid - ANS A triglyceride is a form of what substance? Negative feedback mechanisms work to prevent sudden severe changes within the body - ANS Which of the following statements is true concerning feedback mechanisms? Mostly negative feedback systems - ANS What are most feedback systems in the body? Relatively stable internal environment within limits - ANS Homeostasis is the condition in which the body maintains what? Atoms, Molecules, Cells, Tissue, Organs - ANS Place the following in correct sequence from simplest to most complex (molecules, atoms, organ, tissue, cells) Tissue - ANS Similar cells that have a common function True - ANS A charged particle is generally called an ion (t/f) True - ANS Lipids are a poor source of stored energy (t/f) True - ANS Glucose is an example of a monosaccharide (t/f) True - ANS The pH of body fluids must remain fairly constant for the body to maintain homeostasis (t/f) False - ANS A key feature of the body's metabolism is the almost exclusive use of exergonic reactions by the body (t/f) Glycogen - ANS Carbohydrates are stored in the liver and muscles in the form of what? Decomposition - ANS AB to A + B is an example of what reaction? The release of energy - ANS A chemical reaction in which bonds are broken is usually associated with? ATP - ANS The ___ molecule directly provides energy for cellular work Nucleus - ANS Houses DNA and RNA False - ANS In osmosis, the movement of water occurs toward the solution with the lower solute concentration (t/f) True - ANS Diffusion is always from areas of greater to areas of lower concentration (t/f) The inside of a cell is slightly negative compared to the outside - ANS Regarding the generation of a membrane potential which part of the cell is more negative compared to the other Swell and Burst - ANS A red blood cell placed in pure water would ___? The phospholipid bilayer surrounding the cell - ANS Describe the plasma membrane Molecular transport through the membrane - ANS What is a function of plasma membrane protein? Movement of a substance down its concentration - ANS Passive membrane transport processes include? Water - ANS The main component of the cytosol is? Glycolysis - ANS In this process glucose serves as the initial reactant Krebb Cycle - ANS This process involves the removal of hydrogen electrons and CO2 from the substrate molecule Glycolysis - ANS This process occurs in the cytosol of the cell Electron Transport Chain - ANS This process can produce the greatest total amount of ATP Electron Transport Chain - ANS This process involves the use of oxygen to pick up excess hydrogen and electrons Beta-oxidation - ANS Conversion of fatty acids into acetyl groups is called what? False - ANS Glycolysis is a series of six chemical steps, most of which take place in the mitochondria (t/f) True - ANS In order for amino acids to be oxidized for energy, the nitrogen containing amine group NH2 must be removed (t/f) False - ANS Processes that break down complex molecules into simpler ones are called anabolic (t/f) True - ANS Carbohydrate and fat are oxidized directly to produce cellular energy, but amino acids must first be converted to a carbohydrate intermediate before being sent through cellular respiration pathways (t/f) True - ANS The primary function of carbohydrates is energy production within cells (t/f) Glucose - ANS The molecules that serves as the major source of readily available fuel for neutrons is ___? Biochemical reactions involved in building cell molecules or breaking them down for energy - ANS The term metabolism can be defined as? Absorptive State - ANS Glycogen is formed in the liver during what? Glucose is formed from noncarbohydrate percursors - ANS Gluconeogenesis is the process which? Glycolysis - ANS Which of the three cycles does not occur in the mitochondria? (electron transport, glycolysis, krebs cycle)