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- Nerve impulse, or electrical signal, travels down the nerve to the terminal to cause the release of the neurotransmitter acetylcholine (ACh).
- ACh diffuses across the neuromuscular junction and binds to the receptor sites.
- Stimulation of the receptor sites causes an electrical impulse to form in the muscle membrane. The electrical impulse travels along the muscle membrane and penetrates deep into the muscle through the T-tubular system.
- The electrical impulse stimulates the sarcoplasmic reticulum to release calcium into the sarcomere (a contractile unit of a mofibril) area.
- Calcium allows the actin, myosin, and ATP to interact, causing crossbridge formation and muscle contraction. This process continues as long as calcium is available to the actin and myosin.
- Muscle relaxation occurs when calcium is pumped back into the sarcoplasmic reticulum, away from the actin and myosin. When calcium moves in this way, the actin and myosin cannot interact, and the muscle relaxes.
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What are the 4 stages of a muscle cell?
Tonus (relaxation), Excitation (neural stimulation, Clonus (contraction), Tetanus (prolonged contraction), return to Tonus (relaxation) Or Excitation, Excitation-Contraction Coupling, Contraction, Relaxation
What is the medical term meaning delayed relaxation of a muscle after a strong contraction?
Myotonia means delayed relaxation after a strong contraction.
How do you call the contraction and relaxation?
Contraction and relaxation are two opposites. They work together when the muscles of the body work. A good example is the contraction and relaxation of the heart. The contraction allows blood to be distributed to the parts of the body while the relaxation allows the heart to be oxygenized and therefore fill up blood to be distributed to the whole body.
When does the following terms describes myocardial contraction and relaxation?
When does the following terms describes myocardial contraction and relaxation?Read more: When_does_the_following_terms_describes_myocardial_contraction_and_relaxation
What the opposite of Contraction?
The general opposite of contraction is expansion, or possibly inflation. For muscles, the opposite of contraction is relaxation.
Does the relaxation of the diaphragm causes a slight vacuum the lungs?
No! When you inhale it does. So contraction not relaxation.
The alternating expansion and contraction of artery walls caused by the contraction and relaxation of the ventricles?
Pulse.
The alternative expansion and contraction of the artery walls caused by the contraction and relaxation of the ventricles?
Pulse
Does muscle relaxation does not require ATP?
Both muscle relaxation and muscle contraction require ATP.
What do contraction and relaxation of muscles produce?
It produces protein.
Is the sequence of contraction and relaxation is referred to as a pulmonary cycle?
no
What are the muscles that are slow in contraction and relaxation?
smooth muscle
