Lab 6: Amphibian Muscle Contraction Results: For this experiment‚ Isometric contractions of the gastrocnemius muscle of a frog were analyzed and from this data the latent period‚ twitch‚ motor unit summation‚ tetanus‚ fatigue & mechanical summation were measured. The data was used to quantify the effect of passive tension on the twitch force‚ effect of stimulus intensity on the twitch force‚ effect of stimulus frequency on contractile force of xenopus gastrocnemius muscle. The threshold voltage
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Skeletal Muscle Lab Introduction: Motor neurons and muscle fibers are the building blocks of motor units and where they intersect is called the neuromuscular junciton. The region where the flattened end of a motor neuron transmits neural impulses to a muscle is the motor end-plate. The end plate potentials depolarizes skeletal muscle fibers caused by neurotransmitters binding to the postsynaptic membrane in the neuromuscular junction. The process of contraction of the muscle cell is called excitation-contraction
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Laboratory – Muscle Physiology A. MUSCLE TONUS Observations‚ Report and Conclusion: A. Define muscle tonus and give its importance * Muscle tonus refers to a state of slight muscular contraction maintained by synchronous impulses of low frequency‚ discharged by the spinal motor neurons. * Reflex in nature. * Muscle tonus is a small amount of tension in the muscle due to weak‚ involuntary contractions of its motor units. Muscle tonus is important in a sense that it governs the
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Lab 3 – Skeletal Muscle Physiology Introduction Skeletal muscles are composed of hundreds to thousands of individual cells‚ each doing their share of work in the production of force. As their name suggests‚ skeletal muscles move the skeleton. Skeletal muscles are remarkable machines; while allowing us the manual dexterity to create magnificent works of art‚ they are also capable of generating the brute force needed to lift a 100-lb. sack of concrete. When a skeletal muscle from an experimental
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The muscle physiology of skeletal muscle was observed by using electrical‚ physical‚ and neural stimulations of an isolated gastrocnemius muscle from Rana pipiens. The gastrocnemius receives signals from the action potentials of the sciatic nerve. The muscle contraction is caused by the binding of a neurotransmitter once the action potential reaches the neuromuscular junction. Stimulation of the muscle and the sciatic nerve allows for recording and measuring of these properties. We observed twitch
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Wednesday‚ 13 February‚ 2013 iWorx Lab Report 01 - Agonist/Antagonist Muscles In this first iWorx lab‚ students studied and observed agonist and antagonist muscles. Agonist‚ which are also known as prime movers‚ are the main muscles that are responsible for bringing two bones closer. The antagonist‚ is the muscle that relaxes as the agonist contracts. The lab was a physical example to show students which muscle was which. It also allowed students to see how the muscle activity was recorded by an electromyogram
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Date______________ Period____ Tissues Lab Directions: This lab is broken down into three sections: Epithelial Tissue‚ Connective Tissue‚ and Muscle & Nerve Tissue. For each section‚ read the background and answer any questions before you come to class‚ then in class sketch the specimens listed under each sketch circle. For your sketches‚ include the total magnification under which you viewed the specimen and be very detailed in your sketch. Epithelial Tissue Background Functions of Epithelium
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Laszlo Vass‚ Ed.D. Version 42-0013-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable
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Epithelial tissue protects your body from moisture loss‚ bacteria‚ and internal injury. There are two kinds of epithelial tissues: Covering and lining epithelium covers or lines almost all of your internal and external body surfaces; for example‚ the outermost layer of your skin and other organs‚ and the internal surface lining of your lymph vessels and digestive tract. Glandular epithelium secretes hormones or other products such as stomach acid‚ sweat‚ saliva‚ and milk. Connective tissue generally
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The Muscular System: Skeletal Muscle Tissue 1. Fill in the characteristics of the three muscle types: Muscle Type Cardiac Shape of cell Skeletal branching chains of cells single‚ long cylindrical # of nuclei 15 um in diamter‚ small Striations yes‚ has myofibrils and sarcomers Control involuntary 100 um in size‚ big Smooth single‚ spindle shape cells 2-10 in diameter‚ medium yes‚ presences of myofibrilsno presence of myofibrils and sarcomeres voluntary
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