Preview

Rapid Muscle Contractions

Good Essays
Open Document
Open Document
783 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Rapid Muscle Contractions
The series of events prompting muscle contraction is started some place in the central nervous system, either as willful action from the brain or as reflex action from the spinal cord. Beginning with depolarization at the neuromuscular junction, the depolarizing impulse discharges acetylcholine from the nerve ending. Which then diffuses over the neuromuscular junction (a chemical synapse formed by the contact between a motor neuron and a muscle fiber). At the motor end plate, the acetylcholine joins to its particular receptor locales. The ionic channels (principally sodium) open, permitting the particles to cross the membrane. In the event that an adequate amount of the neurotransmitter is discharged and threshold is achieved, potentials will …show more content…
Acetylcholinesterase is an enzyme that can be found inside of the neuromuscular junction. Accordingly, when a nerve impulse causes the discharge of acetylcholine at the neuromuscular junction, there is a critical point in which the neurotransmitter can attach to receptors on the muscle before it is …show more content…
This could happen after a hard day of work in intense heat, which led to carpopedal spasms. Hence, hypovolemia is happening. This is making the blood redistributed to the imperative organs of the body, such as the mind, heart, and lungs; coordinating it far from practicing skeletal muscle. The skeletal muscle is accordingly presented to low oxygen and expanded waste metabolites. This is what causes the serious cramping. Body liquids are isotonic to a 0.9% sodium chloride solution. Since sodium chloride and water have both been lost due to sweating, substitution of both is key to restore the blood volume back to normal. In people who become unconscious during heat shock, intravenous infusions of 0.9% sodium chloride are

You May Also Find These Documents Helpful

  • Satisfactory Essays

    The Neuromuscular junction uses synapses to connect the muscular system with the muscular system. A nerve impulse is sent from the brain down to the motor neuron by way of the axon. Acetylcholine is released after the vesicles break open. Sodium channels are opened from Acetylcholine that bonds to the Acetylcholine receptors. Depolarization happens when Acetylcholine causes an area of the muscle fiber to become a little more positive when it leaves the nerve and docks on receptors in the muscle membrane. Large amounts of Na+ ions enter the muscle fiber because channels open after depolarization, and an action potential then spreads throughout the muscle fiber. The thick and thin filaments of the muscle fiber can then contract…

    • 504 Words
    • 3 Pages
    Satisfactory Essays
  • Better Essays

    Smooth muscle contraction occurs when calcium is present in the smooth muscle cell and binds onto calmodulin to activate myosin light chain kinase (Wilson et al., 2002). Phosphorylation of myosin light chains result in myosin ATPase activity thus cross-bridge cycling occurs causing the muscle to contract (Horowitz et al., 1996). There are two known models of excitation and contraction in smooth muscle, electromechanical coupling (EMC) and pharmomechanical coupling (PMC) (Droogmans et al., 1997). EMC involves a change in membrane potential as a result of nerve stimulation (Sanders, 2008). Depolarisation causes voltage gated calcium channels to open and contraction occurs. High potassium (K+) concentration causes potassium leak channels to shut down thus no positive charge leaves the cell and the membrane becomes depolarised (Morgan et al., 1981). It is possible to determine if a tissue uses EMC, by depolarising the tissue and seeing if it contracts. Depolarisation of smooth muscle cells through the EMC can be achieved when a K+-depolarisation solution is used as a stimulus, causing calcium release and contraction. On the other hand, PMC does not require a change in membrane potential (Edman, 1962). Rather, drugs mediate smooth muscle contraction, for example acetylcholine (Ach) that bind onto receptors and cause the calcium into the smooth muscle cell causing it to contract (Devine et al., 1972, Sanders, 2008).…

    • 1666 Words
    • 6 Pages
    Better Essays
  • Best Essays

    Acetylcholine is a common neurotransmitter located in the central nervous system and the peripheral nervous system. Acetylcholine acts as a neuromodulator which engage in direct synaptic transmission between specific neurons. In the CNS acetylcholine plays a role in attention and arousal in the PNS it works as a major part of the autonomic nervous…

    • 1921 Words
    • 8 Pages
    Best Essays
  • Good Essays

    Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period. Skeletal Muscle Fiber: Skeletal muscle cells that are composed of hundreds to thousands of individual cells that produce muscle tension. These fibers are what move our bodies and generate muscle tension/force that enables us to have manual dexterity.…

    • 2408 Words
    • 10 Pages
    Good Essays
  • Satisfactory Essays

    Sliding Filament Theory

    • 444 Words
    • 2 Pages

    1. Acetylcholine is released by the axon terminal, diffuses to the muscle cell and attaches…

    • 444 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    Muscle Quiz

    • 1313 Words
    • 6 Pages

    a. Summation/tetanus – Increased frequency of action potentials within the somatic motor neuron leads to increased frequency of stimulation of muscle fiber causing increased force of contraction because another AP (stimulus) arrives in muscle cell before muscle fully relaxes resulting in increased intracellular calcium.…

    • 1313 Words
    • 6 Pages
    Good Essays
  • Powerful Essays

    Skeletal muscle is under voluntary control. Nerve impulses that originate in the central nervous system cause muscles to contract. Both neurons and muscle tissue conduct electrical current by moving ions across cellular membranes. A motor neuron ends in a synapse with a muscle fiber. The neuron releases acetylcholine and transfers the action potential to the muscle tissue. The signal will travel through the tissue and trigger the contraction of individual sarcomeres. One synapse generally controls an entire muscle fiber. One motor neuron usually controls several adjacent muscle fibers. A group of fibers under the control of a single motor neuron is known as a motor unit.…

    • 830 Words
    • 4 Pages
    Powerful Essays
  • Powerful Essays

    Anatomy And Physiology Quiz

    • 2461 Words
    • 10 Pages

    Action potentials are propagated from the surface to the interior of a muscle fiber by way of…

    • 2461 Words
    • 10 Pages
    Powerful Essays
  • Good Essays

    Fart

    • 1711 Words
    • 7 Pages

    Acetylcholine diffuses into the muscle fiber’s plasma membrane and binds to receptors in the motor end plate starting a change in ion permeability that results in a graded depolarization of the muscle plasma membrane.…

    • 1711 Words
    • 7 Pages
    Good Essays
  • Good Essays

    At low frequency, the muscle relaxes completely between stimuli and shows twitches of uniform strength. (b) Treppe. At a moderate frequency of stimulation, the muscle relaxes fully between contractions, but successive twitches are stronger. (c) Wave summation and incomplete tetanus. At still higher stimulus frequency, the muscle does not have time to relax completely between twitches and the force of each twitch builds on the previous one. (d) Complete tetanus. At high stimulus frequency, the muscle does not have time to relax at all between stimuli and exhibits a state of continual contraction with about four times as much tension as a single twitch. Tension declines as the muscle fatigues. Only the conditions in parts (b) and (c) occur in the human body; those depicted in (a) and (d) are produced only by artificial stimultion below or above the range of nerve firing…

    • 1538 Words
    • 7 Pages
    Good Essays
  • Good Essays

    Muscle contractions happen when muscle fibers are stimulated, which can cause one of many types of contractions. Isometric contractions, which means that tension happens in the muscle but there is no change in muscle length, therefore there is no movement of the muscle itself. An example of Isometric contractions would be strength training, such as holding a weight still, which happens in the biceps brachii. The biceps brachii the gets more tension, but the muscle length stays the same. As for isotonic contractions, which means that tension is in the muscle while there is a change of length, can be split into two types: Concentric contraction, in which the tension causes the muscle to shorten, and eccentric, in which the tension causes the muscle to elongate.…

    • 469 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Muscle!

    • 609 Words
    • 3 Pages

    5. What do acetylcholine and cholinesterase do? Ach initiates an electrical impulse in the sarcolemma and cholinesterase degrades Ach after it diffuse away from its receptor on the motor end plate…

    • 609 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Study Guides

    • 557 Words
    • 3 Pages

    -Understand the neuromuscular junction and the components of the neuromuscular junction (synaptic knob, motor end plate, synaptic cleft)…

    • 557 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    activity 2

    • 1695 Words
    • 6 Pages

    The role of acetylcholine in a skeletal muscle contraction is to bind specific receptors on the sarcolemma to open sodium channels so calcium ions can be released into the sarcoplasm…

    • 1695 Words
    • 6 Pages
    Satisfactory Essays
  • Good Essays

    Ch 14 Autonomic System

    • 1014 Words
    • 5 Pages

    7. Acetylcholine (ACh) – All somatic motor neurons release this at their synapses with skeletal muscle fibers.; effects always stimulatory; preganglionic fibers release this as well.…

    • 1014 Words
    • 5 Pages
    Good Essays