Which of these contractions would best promote joint stability? This result counteracts with my prediction. The epimysium is continuous with the perimysium and with tendons Exercise Which of the weights allowed the fastest muscle shortening velocity?
When the weight is heavy, the speed in which the muscle lifts the weight decreases in speed at a slower velocity. Explain why it would take you longer to perform 10 repetitions lifting a kg weight than it would to perform the same number of repetitions with a 5-kg weight.
Skeletal Muscle - striated, voluntary; cells are multinucleate and nuclei are at periphery of cells; cells are very uniform in shape; fiber shape is long and cylindrical; fibers are lined up parallel to each other, have definite striations stripes ; responsible for body movement; not capable of spontaneous contractions Cardiac Muscle - striated, involuntary; cells have one nucleus and nucleus is at center of cells; cells have a branched appearance, and are connected Activity 9 isotonic contractions lab each other with intercalated disks, forming a syncytium action potentials flow from one cell to the next through the intercalated disks ; cells are not lined up neatly as in skeletal muscle; capable of spontaneous contractions autorhythmic ; function is to pump blood throughout the body Smooth Muscle - non-striated, involuntary; cells have one nucleus that is centrally located in the cell; cells are spindle shaped; some types of smooth muscle are capable of spontaneous contraction; contraction of smooth muscle controls: Skeletal, Cardiac and Smooth Exercise - Describe how the shortening distance changed as the load became heavier in this experiment.
Review Sheet Results If you were using your bicep muscles to curl a 7-kg dumbbell, when would your muscles be contracting isotonically? The Mechanism of Muscle Contraction Be familiar with the structure and sequence of events at the neuromuscular junction - view the computer program "ADAM" Be familiar with the molecules involved in muscle contraction, and the events of excitation-contraction coupling and the sliding filament theory - view the computer program "ADAM" Lab Manual Ch What is the name for this type of contraction?
It counteracts with my prediction.
Does the appearance of the fiber change when the chemicals Activity 9 isotonic contractions lab added? This type of contraction would be Isometric. Physiogrip by Intellitool The muscle twitch is a contraction of a muscle in response to a stimulus that produces an action potential at the level of the muscle cell membrane Know the events of the lag phase, contraction phase and relaxation phase.
Does the length change? Was there a change in the circumference of the muscle when the muscle is flexed? Measure the circumference of the biceps brachii muscle: Will the muscle change length?
The shortening distance decreased with the heavier load. Contraction of a Muscle Fiber Understand what molecules are required for muscle contraction and relaxation to occur Follow the directions in the experiment in exerciseexcept use 3 separate microscope slides, one for each muscle fiber; observe the size and shape of each muscle fiber, and the orientation of its striations, before and after you add the various ATP and salt solutions.
When a weight is added? One of you will be the test subject. Why is there a lag phase associated with muscle contraction? With the lighter weight, the muscle is contracted quicker in both latent and shorteningvelocity speeds Describe what would happen in the following experiment: Will the muscle generate force?
Properties of Muscle Tissues: Isotonic vs Isometric Contractions directions at the end of these lecture notes Isometric - the length of the contracting muscle does not change, but tension develops in the muscle; eg.
The muscle changing length would not be from the result of muscle contractions, but only from the weight pulling down. Explain why the shortening velocity became slower as the load became heavier in this experiment.
When lifting a heavy load You correctly answered: What type of contraction have you demonstrated? When the arm rises from the down position back to the raised position and when your arm extends downwards to the point of it being straight Explain why the latent period became longer as the load became heavier in the experiment.
Cardiac, Smooth and Skeletal Muscle Tissue Be able to distinguish the 3 types of muscle tissue on the basis of structure, function and location in the body use Table Thus shortening velocity bacame slower as I predicted.Exercise 2: Skeletal Muscle Physiology: Activity 7: Isotonic Contractions and the Load-Velocity Relationship Lab Report Pre-lab Quiz Results You scored 80% by answering 4 out of 5 questions correctly.
1. During an isotonic concentric contraction, the You correctly answered: b. force generated by the muscle is greater than the weight of. During isotonic contraction, skeletal muscle shortens against a load.
The velocity of Muscle Contraction 3 Lab Activity Introduction: Today we are going to use the gastrocnemius muscle from a bullfrog (Rana Microsoft Word - Muscle Contraction-Physiology killarney10mile.com Lab Activity: Isotonic vs Isometric Contractions (directions at the end of these lecture notes) Isometric - the length of the contracting muscle does not change, but tension develops in the muscle; eg., trying to lift a grand piano, or the contraction.
Activity 2: Twitch Contractions and Summation PREDICTIONS The Effect of Stimulus Frequency on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 25% by answering 1 out of 4 questions correctly.
1. training: the isotonic method and the isometric method of training. The isotonic method is the more conventional. PhysioEx 2: Skeletal Muscle Physiology /lab activity study set; review questions from lab activites STUDY.
PLAY. During an isotonic contraction, the force generated by the muscle is _____ the weight of the attached load. Greater than. Exercise 2: Lab activity PhysioEx STUDY. PLAY. Motor Unit. A motor neuron and all of the muscle fibers it innervates. Isotonic Contraction.
the force generated is greater than the weight of the attached load; increases with heavier loads; length of the muscle changes. Load.Download