What is the voltage beyond which there were no further increases in active force? Maximal voltage: 8.5 V 4. Why is there a maximal voltage? What has happened to the muscle at this voltage? 5. An individual muscle fiber follows the all-or-none principle—it will either contract 100% or not at all. Does the muscle we are working with exhibit the all-or-none principle? Why or why not? Yes be Multiple Stimulus Activity 4: Treppe 1. What do you observe? The Trace rise and fall
Premium Energy Standard deviation Resistor
2: Skeletal Muscle Physiology Student Name: Student ID#: ACTIVITY 1: The Muscle Twitch and the Latent Period Answers 1. The latent period of the skeletal muscle that was tested in this lab simulation was a. about 1 second. b. less than 1 msec. c. between 2-3 msec. d. variable‚ depending on the voltage that was applied to it. C. 2. True or False: Another name for a muscle cell is “myofibril.” False 3. The largest active force that could be generated in the muscle is Activity
Premium Skeletal muscle Muscular system Muscle
The neuromuscular junction (NMJ) is a synapse. true 14. The action potential in skeletal muscle travels through the muscle via T-tubules true 15. Ca2+ is essential for normal contraction of skeletal muscle. true 16. A twitch of one skeletal muscle fibre is an example of a graded response. TRUE 17. A motor unit is a single motor neurone and the muscle fibres that it innervates. true 18. The three phases of a muscle twitch are described as latent‚ contraction and relaxation. true 19. The force exerted
Premium Action potential Skeletal muscle Muscle
TIME/DATE ___10/24/13__ Exercise 2 Skeletal Muscle Physiology The Muscle Twitch and the Latent Period 1. Define the terms skeletal muscle fiber‚ motor unit‚ skeletal muscle twitch‚ electrical stimulus‚ and latent period. Skeletal muscle fiber-fibers attached to the skeleton that produce muscle tension. Motor unit-consists of the motor neuron and all of the muscle fibers. Skeletal muscle twitch-mechanical response to a single action potential. Electrical stimulus-muscle contractions. Latent period-
Premium Skeletal muscle Muscular system Neuromuscular junction
four (4) functional characteristics of all muscle tissues -Excitability or Responsiveness- The ability to receive and respond to a stimulus that is any change in the environment whether inside or outside the body. In the case of muscle ‚the stimulus is usually a chemical for example - a neurotransmitter released by a nerve cell‚ or a local change in ph. The response is generation of of an electrical impulse that passes along the sarcolemma of the muscle cell and causes the cell to contract. Contractility-
Premium Muscle Skeletal muscle Muscular system
Unit 2: Physiology Lab Skeletal Muscle Physiology Student Name: Lab Summary Worksheet Directions: Read the following directions before starting the lab. Before starting each lab Activity‚ read the Overview and Introduction. This information will help you understand what you are doing in the lab. You do not have to pdf your lab – the only thing that you will submit for grading is this lab report. You will have to answer the Stop and Think Questions that are embedded in the lab instructions
Free Muscle contraction Muscle Muscular system
Exercise 2: Skeletal Muscle Physiology: Activity 1: The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You scored 20% by answering 1 out of 5 questions correctly. 1. Skeletal muscles are connected to bones by Your answer : c. ligaments. Correct answer: b. tendons. 2. Skeletal muscles are composed of hundreds to thousands of individual cells called Your answer : b. myofibrils. Correct answer: c. fibers. 3. The term motor unit refers to Your answer : b. all of the activated muscle fibers
Premium Neuromuscular junction Skeletal muscle Acetylcholine
Exercise 2: Skeletal Muscle Physiology: Activity 1: The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You scored 100% by answering 5 out of 5 questions correctly. 1. Skeletal muscles are connected to bones by You correctly answered: b. tendons. 2. Skeletal muscles are composed of hundreds to thousands of individual cells called You correctly answered: c. fibers. 3. The term motor unit refers to You correctly answered: c. one motor neuron and all of the skeletal muscle fibers it
Premium Skeletal muscle Neuromuscular junction Acetylcholine
Kathleen thomason October 2‚ 2012 Skeletal Muscle physiology exercise Electrical Stimulation name each phase of a typical muscle twitch and on the following line. Describe what is happening in each phase. a) latent- is a short period between the time of stimulation and the beginning of contraction b). Contraction – at this stage the muscle reaches its peak in contraction. Relaxation -Muscle is shortened‚ returns to zero and back initial length.
Premium Muscle Skeletal muscle Myosin
Exercise 2: Skeletal Muscle Physiology: Activity 1: The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 010/03/12 page 1 Experiment Results You have not completed the Experiment. Experiment Data: 010/03/12 page 2 Post-lab Quiz Results You have not completed the Post-lab Quiz. 010/03/12 page 3 Review Sheet Results 1. Define the terms skeletal muscle fiber‚ motor unit‚ skeletal muscle twitch‚ electrical
Premium Skeletal muscle Acetylcholine Muscle