Frog skeletal muscle is used as an animal model to study muscle contraction. The objectives of this experiment is to demonstrate the physiological responses of skeletal muscle to electrical stimuli using frog gastrocnemius‚ to understand twitch‚ summation‚ tetanus and fatigue‚ to investigate the relationship between initial tension and force of contraction‚ to explore the differences between human and frog skeletal muscle. The threshold voltage is 0.4V. The minimum voltage required to give a maximal
Premium Neuromuscular junction Skeletal muscle Acetylcholine
The Muscular System: Neuromuscular Junction 1. What insulates each muscle cell? __________endomysium_______________ 2. Synaptic vesicles in the axon terminal of a motor neuron contain what neurotransmitter? __________acetylcholine_______________ 3. An action potential in the axon terminal of a motor neuron opens what type of ion channels? ____________Voltage-gated Calcium_____________ 4. By what means of membrane transport does the neurotransmitter leave the axon
Premium Myosin Action potential Muscle
continue to follow this trace continuously. 7. What part of the trace shows the refractory period? The atrial contraction is the part of the trace that shows the refractory period 8. Does summation occur? No summation 9. Why is it important that summation not occur in heart muscle? Summation would increase the Heart muscle contractions which would lead to heart attack. Activity 2: Vagus Nerve Stimulation 1. Describe the effect of the vagus nerve stimulation on the heartbeat
Premium Acetylcholine Parasympathetic nervous system Nervous system
REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: LAB TIME/DATE: Electrical Stimulation 1. Name each phase of a typical muscle twitch‚ and‚ on the following line‚ describe what is happening in each phase. a. b. c. 2. In Activity 2‚ how long was the latent period? __________ msec Describe the chemical changes that are occurring during this period. The Graded Muscle Response to Increased Stimulus Intensity 3. From Activity 3‚ describe the effect of increasing
Premium Muscle Skeletal muscle Muscular system
COLLEGE OF ARTS‚ SCIENCES AND EDUCATION DEPARTMENT OF POLITICAL AND SOCIAL SCIENCE PARLIAMENTARY PROCEDURE (POG 222) CONCEPT PAPER FOR CLASS ACTIVITY OBJECTIVE Provide an avenue for Political Science students of Columban College to articulate their views vis-à-vis social and political issues on local‚ national and international milieu utilizing the rules of Parliamentary Procedure within the parameters of democratic process. MECHANICS There shall be six (6) issues to be given a resolution
Premium Parliamentary procedure Debate Political science
and coupling. At 30mm‚ the sarcomere is too taut to allow cross-bridges to form and contract. At 26mm‚ the sarcomeres are already shortened and further contraction is very limited. Summation & Tetanus Lab Summation means the muscle contracted but it didn’t go back to resting before it contracted again. Summation was first observed at 200 milliseconds. Incomplete tetnus is where the muscle contracts so that the single contractions produced more
Premium Neuromuscular junction Muscular system Potassium
HNC/HND OPERATION ENGINEERING ASSIGNMENT ONE QUALITY ASSURANCE&MANAGEMENT STUDENT NAME: REDA MOHAMED STUDENT NUMBER: 0239 DATE OF ISSUE: 28/06/2012 TUTOR: Dr Chris Question1: Based on evaluation of the information received in the LPI ‚ case study materials you should prepare a proposal report to the LPI LTD‚ management team on how they could implement TQM and what they should concentrate efforts on improving. Introduction
Premium Quality management Quality control Total quality management
Bomi Shroff Principles of Econometrics‚ 4th Edition Probability Primer Page 2 Chapter Contents ¡ P.1 Random Variables ¡ P.2 Probability Distributions ¡ P.3 Joint‚ Marginal and Conditional Distributions ¡ P.4 A Digression: Summation Notation ¡ P.5 Properties of Probability Distributions ¡ P.6 The Normal Distribution Principles of Econometrics‚ 4th Edition Probability Primer Page 3 1 1/08/13 P.1 Random Variables Principles of Econometrics
Premium Probability theory Random variable Normal distribution
your raw data file) representing the relationship between tension development and stimulus intensity. Did tension increase when you set the stimulator to voltages greater than the maximum voltage (explain why or why not)? 6. Define temporal summation. Present the data (i.e. include an Excel figure suitable for a report; this does NOT mean simply copy and paste your raw data file) you collected as the stimulation frequency increased. Compare and contrast the development of tension as a function
Premium Neuromuscular junction Acetylcholine Skeletal muscle
active muscles require decreasing degrees of succeeding stimuli to elicit maximal contractions Exercise 3: Wave Summation A. Explain why wave summation occurs. Wave summation occurs when a second stimulus is applied before the first stimulus is lost. The two responses combine to produce a greater muscle tension than produced be a single response. B. Can summation go on infinitely? Why or why not? If the stimulation continues and muscle never reaches its relaxation period
Premium Muscle contraction Muscular system Muscle