Muscle Fiber contractions for our purposes begins with the arrival of action potential (action potential- is an electrical current) at the end of the axon terminal (axon terminal- the swollen distal end of the motor neuron axon). When the action potential reaches the axon terminal the action potential causes the voltage- gated calcium ion channels to open allowing calcium to flow in from extracellular fluid. The presence of calcium in the axon terminal causes synaptic vesicles (synaptic vesicles-
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ions during contraction of a skeletal muscle? Calcium is an important element for live. Calcium is found in the bones of animals and humans. In muscle contraction is produce as a result of Calcium ions ‚ Ca2+‚ It comes from rapid release from the cisternae of the sarcoplasmic reticulum which cause a chemical reaction between ATP and the myofilaments. Another important function of Calcium ions occurs during the state of resting muscle. During the state of resting muscle‚ calcium Ion is “maintaining
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An activity that primarily utilizes type I muscle fibers is long distance running. Type I fibers are generally slow-twitch fibers‚ meaning they contract slowly and have a high capacity for aerobic glycolysis. Ectomorphs usually perform long distance running. In order to train slow twitch muscles (training slow twitch muscle fibers is for endurance purposes and other aerobic activities)‚ one must increase the time under tension (TUT). Specifically‚ one must focus on doing higher reps (12-15) and low
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Muscle Description Muscles of the Head: Facial Expression Origin Insertion Action bipartite muscle‚ Epicranius:includes frontalis connected by galea & occipitalis aponeurotica covers forehead‚ no bony attachments galea aponeurotica skin of eyebrows and root of raises eyebrows (as in surprise); nose wrinkles forehead skin horizontally Occipitalis back of head occipital and temporal bones galea aponeurotica pulls scalp posteriorly Corrugator supercilii
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threshold voltage differ from the graphs generated at voltages below the threshold? There is no movement below the threshold. However‚ there is a tiny increase between 10 and 50 of the force line. A C T I V I T Y 3 Effect of Increases in Stimulus Intensity 3. Observe your tracings. How did the increases in voltage affect the peaks in the tracings? They increased with each increase in voltage. How did the increases in voltage affect the amount of active force generated by the muscle? The force increased
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REVIEW SHEET EXERCISE 2 Skeletal Muscle Physiology NAME: LAB TIME/DATE:9pm.. 4.8.11 Electrical Stimulation 1. Name each phase of a typical muscle twitch‚ and‚ on the following line‚ describe what is happening in each phase. a. Latent-stage from rest to muscle tension begins b. Contraction-At this stage the muscle reaches its peak in contraction c. Relaxation- muscle is shortened‚ returns to zero and back initial length. 2. In Activity 2‚ how long was the latent period? ___2
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Introduction: In this lab‚ I will study how muscles contract‚ what makes muscles contract‚ different types of muscle contraction‚ and learn about how resistance affects muscle contraction. I will define Key Terms that describe what will occur in the experiments; I will conduct an experiment for each Activity and provide all resulting Data as well as answer Questions from each Activity. I will then provide a short Summary for what I learned in each Activity. Key Terms: Recruitment (or Multiple
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LABORATORY REPORT Activity: Action Potentials Name: Caitlin Magnacca Instructor: Date: 03.19.2015 Predictions Exceeding threshold depolarization at the trigger zone______the likelihood of generation of an action potential. increases Action potential amplitude decreases with distance Increasing frequency of stimulation to the trigger zone increases number of action potentials Materials and Methods Experiment 1: Effect of Stimulus Strength on Action Potential Generation Dependent Variable membrane
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The action of ANS-related drugs on smooth muscle Introduction In the following experiment‚ the key objective is to compare the mechanical changes in tonic force by longitudinal smooth muscle after the addition of different concentrations of the drugs noradrenaline and acetylcholine. Peristalsis is the wave of muscle contractions that allow circular muscles to constrict the gut and longitudinal muscles to shorten it in an attempt to move the food bolus towards the rectum. A series of dilutions
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enzyme activity in skeletal muscle‚ particularly the activity of lactate dehydrogenase (LDH). LDH is a glycolytic enzyme which converts pyruvate to lactate in the following equation: LDH Pyruvate+ NADH ------------ Lactate + NAD The reaction above can move in both directions‚ forward (favored by Type II skeletal muscle) and reverse (favored by Type I skeletal muscle and the heart). Enzyme
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