3 mess, the interval from stimulus application until the muscle begins to shorten b) contraction phase, -??27 mess, the muscle fibers shorten c) relaxation phase, 110 mess, the muscle fibers relax & lengthen 7. 1) d 8. 1) rapid 2) lactic acid 3) more 10. The muscle become paralyzed & flaccid, & atrophy 1 1 . As the load on a muscle increases, its strength of contraction also increases until the muscle reaches maximal force generated. 12. The way the skeletal muscles attached to skeletal system makes them slightly trenched.
By changing the length, the arrangement of myosin & cacti is less optimal causing less favorable binding of Ca++ 14. Due to wave summation, the muscle will contract more rapidly. 15. Producing a steady increase in muscle force by increasing the # of active motor units 16. After prolonged activity, there’s an accumulation of lactic acid & depletion of TAP, ion imbalances or tissue damage, hence the loss of the ability to contract, or muscle fatigue. Physique Skeletal Muscle Physiology (all) Activity 1 Skeletal Muscle Physiology: Frogs & Human
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Subjects By sideways 1 Skeletal muscle fibers: cells that composes skeletal muscle Motor unit: 1 motor neuron & all of the skeletal muscle fibers it innervates. Skeletal muscle twitch: 1 contractile response to a single AP Electrical stimulus: excitation of muscle contraction using electrical impulses. Latent period: the start of muscle contraction 2. Initiating a change in ion permeability that results in a graded deportation of the muscle plasma membrane 3. The entire process starting from the release of ACH that creates a graded potential eating to the end-plate potential, triggering events that results in the muscle contractions. . The latent period: time that elapses b/w the generation of an AP in a muscle cell & the start of muscle contraction Contraction phase: starts at the end of the latent phase & ends when muscle tension peaks Relaxation phase: time from peak tension until the end of muscle contraction. 5. It doesn’t change. Results match predictions 6. Sodium ions move in the cell to bring about the membrane deportation. Activity 1 . Maximal voltage at which all skeletal muscle fibers are activated. Results match predictions 2.
Each fiber in the muscle receives direct stimulation via a nerve ending 3. All of the skeletal muscle fiber are activated. Activity 3 1. Intensity: strength of stimulus Frequency: rate of delivery 2. This is trapper. The 2nd force is larger than the 1st force 3. Wave summation. The force keeps adding up when the muscle twitches don’t fully relax. Results match 4. Continuous frequency of stimulations will achieve an active force of 5. G. Results match predictions 5. The more we have, the higher the force. Wave summation is about the rapid frequency.
Motor unit recruitment is about # of activated fibers. They can be achieved by increasing the frequency of stimuli. Activity 4 1 . The force increases until it reaches the plateau. The result matches the prediction 2. Active force w/ different stimulus. The higher the frequency the higher the active force. 3. 146 stimuli/sec. Maximal titanic tension Activity 5 1 . The contractile force decreases over time 2. The buildup of lactic acid, TAP, & Pi 3. The rest period alters the onset of fatigue in the skeletal muscle. Results match 4. Intervening rest periods & eat healthy