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Ion channels
itaca.edu.es
- This movement is controlled by selective opening and closing of specialized proteins in the membrane called ion channels. Although the currents generated by ions moving through these channel proteins are very small, they form the basis of both neural signaling and muscle contraction.
open.oregonstate.education/aandp/chapter/10-3-muscle-fiber-excitation-contraction-and-relaxation/
Once the muscle fiber is stimulated by the motor neuron, actin, and myosin protein filaments within the skeletal muscle fiber slide past each other to produce a contraction. The sliding filament theory is the most widely accepted explanation for how this occurs.
- 15.5: Physical Exercise
Aerobic exercise is any physical activity in which muscles...
- Nervous System
This chapter describes neurons and other cells of the...
- 15.5: Physical Exercise
Factors, such as hormones and stress (and artificial anabolic steroids), acting on the muscle can increase the production of sarcomeres and myofibrils within the muscle fibers, a change called hypertrophy, which results in the increased mass and bulk in a skeletal muscle.
- Lindsay M. Biga, Sierra Dawson, Amy Harwell, Robin Hopkins, Joel Kaufmann, Mike LeMaster, Philip Mat...
- 2019
Apr 1, 2023 · There are four types of striated muscle contractions: isometric, isotonic, concentric, and eccentric (see Figure. Muscle Contraction Categories). Isometric striated muscle contraction is characterized by a change in muscle tension without a change in muscle length.
- Matthew C. Gash, Patricia F. Kandle, Ian Murray, Matthew Varacallo
- 2023/04/01
- 2018
Ca 2+ regulates contraction of both striated and smooth muscles, but the mechanisms are different. Rather than binding to Tn on thin filaments in striated muscle, Ca 2+ in smooth muscle leads to phosphorylation of the myosin RLC.
May 1, 2023 · In contrast to both smooth muscle and cardiac muscle, skeletal muscle contracts primarily in response to a voluntary stimulus. As organs that contain cells that can contract, muscles can generate force and movement.
- Steven Pham, Yana Puckett
- Lake Erie College of Osteopathic Medicine
- 2021
- 2023/05/01
Describe the physiology of muscle contraction, including the roles of the following components: calcium ions (Ca 2+), troponin, tropomyosin, myosin, actin, and ATP. Describe the generation of a muscle action potential, including the roles of acetylcholine (ACh) and sodium (Na +) ions.
The force of skeletal muscle contraction can be considered to be modulated by several fundamental factors: calcium concentration or frequency of activation, sarcomere length, and velocity of shortening. Each of these fundamental properties of muscle will be described here.
