twitch-mechanical response to a single action potential. Electrical stimulus-muscle contractions. Latent period- during a contraction there is a rise in muscle tension. 2. What is the role of acetylcholine in a skeletal muscle contraction? -Trigger action potential. 3. Describe the process of excitation-contraction coupling in skeletal muscle fibers. –The motor end plate produces potential and results in contraction of a single cell. 4. Describe the three phases of a skeletal muscle twitch
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not? No‚ because it will contract and then relax if needed or to get accustomed Multiple Stimulus Activity 4: Treppe 1. What do you observe? The peak rose higher each time Activity 5: Summation 1. What is the active force of the contraction? 1.62 gms 2. What is the active force now? 2.51 gms 3. Was there any change in the force generated by the muscle? Yes‚ 1.91 gms 4. Was there any change in the force generated by the muscle? Yes‚ 2.65 gms 5. Why has the force changed
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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‚ while the force in grams increased. Activity 5: Summation 1. What is the active force of the contraction? 1.83 gms 2. What is the active force now? 2.77 gms 3. Was there any change in the force generated by the muscle? No 4. Was there any change in the force generated by the muscle? Yes 5. Why has the force changed? 6. Do you see the
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Module Question Answer 8.1 (b) Describe the components of a synovial Joint‚ and identify the functions of each. Components of a synovial joint are: Fibrous articular capsule (or joint capsule)‚ which surrounds the joint Articular cartilages‚ which resemble hyaline cartilages and cover the articulating bone surfaces Synovial fluid‚ which is located within the joint cavity and provides lubrication‚ distributes nutrients‚ and absorbs shocks 8.2 (a) Identify the types of synovial joints based
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from an experimental animal is electrically stimulated‚ it behaves in the same way as a stimulated muscle in the intact body‚ that is‚ in vivo. Hence‚ such an experiment gives us valuable insight into muscle behavior. The Motor Unit and Muscle Contraction A motor unit consists of a motor neuron and all of the muscle fibers it innervates. Motor neurons direct muscles when and when not to contract. A motor neuron and a muscle cell intersect at what is called the neuromuscular junction. Specifically
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during movement in order to support the main movement occurring. * ISOMETRIC (Static Contraction) Muscle contracts but does not change in length. Two Types of Isotonic Contractions are: * CONCENTRIC Muscle shortens‚ contracts‚ working muscle. (Also known as the AGONIST) * ECCENTRIC Muscle lengthens‚ relaxing muscle. (Also known as the ANTAGONIST) * ISOTONIC (Dynamic Contraction) Muscle contracts and there is change in length causing movement. * FUNCTION OF BONES
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\--’-S -::. ~ .\d.u Isometric contraction: Contraction occurring in which the muscle does not shorten but ..‚_internal tension increases. Isotonic contraction: The muscle changes in length and tension remains constant throughout the range of motion and the load. There are two types of isotonic contraction (concentric and eccentric). ti) Concentric contraction: When a muscle shortens through constant tension and range of motion moving a load. b) Eccentric contraction: The muscle lengthens with constant
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Muscle Tissue Introduction * Motion * Results from alternating contraction (shortening) and relaxation of muscles * Skeletal system * Provides leverage and a supportive framework for this movement * Myology – study of muscles Muscle Tissue * Alternating contraction and relaxation of cells * Chemical energy changed into mechanical energy Types of Muscle Tissue * Skeletal muscle – primarily attached to bones * Striated and voluntary * Cardiac
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A&P Exam #3 Ch 9&10 1) Know the 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
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tendons that then move bones 2.Maintain posture and body position 3.Support soft tissues •With the muscles of the abdominal wall and the pelvic floor 4.Guard entrances and exits •In the form of sphincters 5.Maintain body temperature •When contraction occurs‚ energy is used and converted to heat Skeletal muscles are organs Made of: •Connective tissue •Blood vessels •Nerves •Skeletal muscle tissue 2. List and describe the three layers of connective tissue associated with muscles.
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