FROG MUSCLE PHYSIOLOGY 2) What was the smallest voltage required to produce max contraction? What proportion of the muscle fibers in the muscle do you think were contracting to produce this maximal response? Muscle fibers act in response to isolated stimuli in an all or none fashion. However‚ a muscle organ‚ such as the gastrocnemius muscle‚ is composed of many individual muscle fibers. It is known that all of the fibers in a muscle do not have the same threshold and that a stimulus applied to
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TRUE/FALSE. Write ’T’ if the statement is true and ’F’ if the statement is false. 1)Hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones. 1) T 2) Bones are classified by whether they are weight-bearing or protective in function. 2) F 3) The trabeculae of spongy bone are oriented toward lines of stress. 3) F MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 4) The cell responsible for secreting
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Text Edition (10th/11th/12th) is specified if the figure numbers are DIFFERENT in the editions. If figure numbers are the SAME‚ then the edition is not specified. ****502 Students: Read this paragraph **** If you are a 502 student using this guide‚ this is based on Dr. Rust’s lectures in Physiol 201. Topics may have been covered in more detail in 502 or the coverage or emphasis may have been different since many topics in 502 were taught by other professors- so use your notes and slides along
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platelate plugs‚ and action potentials are all positive feedbacks loops. 2. Describe the four physiological themes discussed in the book that apply to all living organisms. Theme 1: Structure and function are closely related: by dividing space into compartments (structure) it allows cells‚ tissues‚ organs‚ etc to specialize and isolate functions such as molecular interactions (function) which is the ability of individual molecules to bind to or react with other molecules. Theme 2: Living organisms
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AP Psychology Extra Credit Vocab Unit 1: History‚ approaches and research methods 1. Psychology – the study of the human mind and its functions 2. Empiricism – the view that knowledge originates in experience and that science should‚ therefore‚ rely on observation and experimentation 3. John Locke – Created idea of “tabula rasa” (blank slate)‚ which means that the mind at birth is blank and we learn from experience. 4. Wilhelm Wundt – did psychology’s first “experiment”‚ while seeking to measure
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Cardiovascular System: Intrinsic Conduction System 1. The intrinsic conduction system consists of __autorhythmic____ __cardiac__ cells that initiate and distribute __impulses_____ throughout the heart. 2. The intrinsic conduction system coordinates heart activity by determining the direction and speed of ____heart depolarization____. This leads to a coordinated heart contraction. 3. List the functions for the following parts of the intrinsic conduction system: a. SA node _sets the pace for the
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(Martini‚ 376). A Myelin sheath can be found in both nerves and neurons (Martini‚ 383). Myelin is an electrical insulation on the axon that increases the speed at which action potential travels
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increase the action potential frequency. The muscle cramps caused by the disease tetanus are not classified as tetany; rather‚ they are due to a blocking of the inhibition to the neurons that supply muscles. Contents [hide] 1 Mechanism 2 Causes 3 Diagnosis 4 References 5 External links [edit]Mechanism Low plasma calcium increases the permeability of neuronal membranes to sodium ions‚ causing a progressive depolarization. This increases the ease with which action potentials can be initiated
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threshold that has to be reached for action potential to be detected. For example‚ if resting membrane potential of a neuron is -70 mV and sodium ions are added it would cause the voltage to drift toward -55mV because the equilibrium potential for sodium is +60 mV. However‚ a few sodium ions would not cause the voltage to change. An extensive amount of sodium ions has to be added to the dendrite of a neuron to drop the voltage to -55 mV. When the membrane potential shifts from -70 mV towards -55 mV
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sequence to describe excitation-contraction coupling. Step 1 has been numbered for you. ___1____ 1. Acetylcholine is released by the axon terminal‚ diffuses to the muscle cell and attaches To ACh receptors on the sarcolemma. ________ 2. The action potential‚ carried into the cell via the T-tubules‚ causes the SR to release Calcium ions. ________ 3. Ach-E breaks down Ach‚ which separates from its receptors. ________ 4. The muscle cell relaxes and lengthens. ________ 5. The calcium
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