should become experts on excitation-contraction coupling. 5. Group 5 should become experts on summation and tetanus. 6. Group 6 should become experts on smooth muscle contraction. 7. What are the three types of muscle found in the human body? Where can you find each‚ and what does each do? Cardiac – found in the heart Smooth – internal organs and tubes‚ stomach‚ urinary bladder Skeletal – attached to bones 8. What controls the contraction of the different types of muscle?
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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
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acetylcholine in a skeletal muscle contraction? Skeletal muscle fiber-Skeletal muscle fibers are the individual cells that are bound together in fascicles. Many fascicles are bound together to make a muscle Motor unit-A motor unit consists of a motor neuron and all of the muscle fibers in innervates. Skeletal muscle twitch-A skeletal muscle twitch is a mechanical response to a single action potential. Electrical stimulus- used to mimic the contractions of skeletal muscles Latent period-Latent
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following terms: • motor unit - A motor unit consists of a motor neuron and all of the muscle fibers it innervates. • twitch - Skeletal Muscle twitch is the mechanical response to a single action potential. It has three phases known as the latent‚ contraction‚ and relaxation phase. • threshold - the threshold is the minimal stimulus needed to cause a depolarization of the muscle plasma membrane (sarcolemma.) The threshold is the point at which sodium ions start to move into the cell (instead of out of
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neurotransmitter molecules (ACh) D. Motor Units - A.D.A.M. Physiology: Contraction of Motor Units p. 3 only 1. Small motor units (fewer myofibers innervated) 2. Large motor units (more myofibers innervated) III. Skeletal Muscle Physiology: See IP-CD: Sliding Filament Theory. A. Summary of the Sliding Filament Model of Muscle Contraction In your own words‚ write a brief summary of the process of muscle contraction. 1. _____________________________________________________________
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BioLab3 Bones and Muscles Summary Report Student Name: I. Skeletal system A. Long Bone Structure Define the following terms. Bone Organ of the skeletal system Cartilage Serves as a cushion Ligament Dense‚ regular connective tissue/bone to bone Tendons Dense‚ regular connective tissue/ bone to muscle Osteocytes Separated by an extracellular matrix hardened by deposits of calcium salts Diaphysis Long shaft of compact bone Compact bone Solid and dense
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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? ___2.2_______ msec Describe the chemical changes that are occurring during this period. Calicum levels are low since muscle contaction is not at its peak. Preparing for the the contraction Ca begin the process of sending Acetychlorine binding
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wave of excitation that travels rapidly along the cell and initiates processes leading to contraction. c. Contractility-Muscle cells are unique in their ability to shorten substantially when stimulated.-This enable them to pull on bones and other organs to create movement. d. Extensibility- In order to contract‚ a muscle cell must alson be extensible able to stretch again between contractions.- Most cells rupture if they are stretched even a little‚ but skeletal muscle cells can stretch
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therefore produce muscle contraction? d. Where is ionic calcium stored in the contractile unit? 10. Name the model which describes muscle contraction based on the molecular changes within the cell. 11. What is the physiological meaning of “contraction”? 12. a. Name the sequence of events which converts a nerve signal into muscle contraction. b. List and briefly describe the key steps in this sequence. c. Which step is the basis of muscle contraction? d. What role
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smooth muscle. True A contraction in which the muscle does not shorten but its tension increases is called isometric True One of the important functions of skeletal muscle contraction is production of heat. True What is the role of tropomyosin in skeletal muscles? A) Tropomyosin is the name of a contracting unit. B) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules. C) Tropomyosin serves as a contraction inhibitor by blocking the
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