What is the process of excitation contraction coupling in a smooth muscle cell?
Table of Contents
- 1 What is the process of excitation contraction coupling in a smooth muscle cell?
- 2 What is the process of excitation contraction coupling?
- 3 What is the process of excitation-contraction coupling in skeletal muscle fibers?
- 4 Which of the following best describes the contraction phase of the excitation-contraction coupling reaction choose the best Answe?
- 5 How is contraction of a skeletal muscle fiber brought about?
- 6 How does the process of excitation-contraction coupling and relaxation help body movement?
- 7 How do the contraction mechanisms of smooth and skeletal muscles differ?
- 8 What is the excitation-contraction coupling process in skeletal muscle?
- 9 What is the ECEC coupling in striated muscle?
- 10 How are action potentials propagated along the sarcolemma?
What is the process of excitation contraction coupling in a smooth muscle cell?
Excitation contraction coupling is at term used to describe the physiological process of converting an electrical stimulus to a mechanical response. The general action process is that an action potential arrives to depolarise the cell membrane.
What is the process of excitation contraction coupling?
Excitation–contraction coupling is the physiological process of converting an electrical stimulus to a mechanical response. It is the link (transduction) between the action potential generated in the sarcolemma and the start of a muscle contraction.
How does smooth muscle contraction work?
Smooth muscle cells also develop tonic and phasic contractions in response to changes in load or length. Regardless of the stimulus, smooth muscle cells use cross-bridge cycling between actin and myosin to develop force, and calcium ions (Ca2+) serve to initiate contraction.
What is the process of excitation-contraction coupling in skeletal muscle fibers?
Skeletal Muscle Function Excitation-contraction coupling involves the transformation of depolarizing events in the sarcolemma into the initiation of mechanical shortening of the myofibrils within the myofiber by calcium ions released from the terminal cisternae of the sarcoplasmic reticulum (SR).
Which of the following best describes the contraction phase of the excitation-contraction coupling reaction choose the best Answe?
Table 1
| Proteins | Slow-twitch fibres | Fast-twitch fibres |
|---|---|---|
| Isoform | Content/ kinetics | |
| SERCA | SERCA2a | + to ++ |
| Phospholamban | Phospholamban | – |
| Sarcolipin | Sarcolipin | +++ |
How do you strengthen smooth muscles?
Smooth muscle can neither be actively trained nor can it fatigue. However, you can improve its capacity indirectly through physical labor. Sports, such as Freeletics for example, strengthen your cardiovascular system and therefore ensure a better supply of your smooth muscle tissue with blood and nutrients.
How is contraction of a skeletal muscle fiber brought about?
The sliding filament theory is the explanation for how muscles contract to produce force. As we have mentioned on previous pages, the actin and myosin filaments within the sarcomeres of muscle fibres bind to create cross-bridges and slide past one another, creating a contraction.
How does the process of excitation-contraction coupling and relaxation help body movement?
Excitation-contraction coupling is the mechanism that links plasma membrane stimulation with cross-bridge force production. Muscle action potentials produced by the excitation-contraction coupling initiate calcium signals. The calcium signals activate a contraction-relaxation cycle.
Which selection best describes the initial event in contraction?
Which best describes the initial event in contraction? Myosin heads bind to the newly exposed myosin-binding sites on actin to form cross bridges.
How do the contraction mechanisms of smooth and skeletal muscles differ?
In skeletal muscle, calcium causes tropomyosin to shift, exposing the myosin-binding site on actin and starting contraction. In smooth muscle, calcium activates a kinase that phosphorylates light chains on myosin, leading to contraction.
What is the excitation-contraction coupling process in skeletal muscle?
In skeletal muscle, the release of calcium to begin allowing cross-bridge formation and contraction is coupled to excitation signaling of action potentials from a motor neuron. Thus, the excitation-contraction coupling process begins with signaling from the nervous system at the neuromuscular junction
What is the role of calcium in the excitation and contraction cycle?
Muscle action potentials produced by the excitation-contraction coupling initiate calcium signals. The calcium signals activate a contraction-relaxation cycle. Contraction refers to activation of the cross-bridge cycle. Ca 2+ activates the attractive forces between the filaments of actin and myosin by binding to troponin ( Figure 7-4 ).
What is the ECEC coupling in striated muscle?
EC coupling in striated muscle depends on the functional coupling of the junctional ER with sarcolemma structures; dyads and triads in cardiac and skeletal cells, respectively.
How are action potentials propagated along the sarcolemma?
Propagation of an action potential along the sarcolemma is the excitation portion of excitation-contraction coupling and must be coupled to the release of calcium ions for contraction. High concentrations of calcium in skeletal muscle are stored in a specialized type of smooth endoplasmic reticulum organelle called the sarcoplasmic reticulum (SR).