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How does the membrane action potential get to the sarcoplasmic reticulum?
Wiki User
∙ 11y ago
It travels down a T-tubule.
Wiki User
∙ 11y ago
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What transmission of the depolarization wave along the neurons membrane?
Action potential
What would happen if acetylcholine was released into a neuromuscular junction?
It attaches to its receptor, and binds. Causes another action potential, (calcium released) and it goes to the T-tubule of the Sarcoplasmic reticulum, and attaches to troponin, which moves the tropomyosin, so the myosin and actin and attach, and cause a muscle contraction.
What is the MOA of hydralazine?
The mechanism of action of hydralazine is not well known. It interferes with the action of the second messenger IP3, limiting calcium release from the sarcoplasmic reticulum of smooth muscle. This results in an arterial and arteriolar relaxation answer found on Wikipedia
What is trigger calcium?
In the fast response action potential of cardiac muscle, the sarcolemma rapidly depolarizes and reaches a plateau. In the plateau phase, Ca2+ released by the glycocalyx comes into the muscle cell from the extracellular fluid. This Ca2+ is called "trigger Ca2+" because it induces the release of Ca2+ from the sarcoplasmic reticulum.
What is the falling phase of action potential?
Hyperpolarization (the membrane potential becomes more negative)
When is calcium pumped into the sarcoplasmic reticulum?
When Ach enters the synaptic cleft (gap) it open chemically gated sodium channels that starts an action potential spreading through the sarcolemma of the myofibril. This action potential spreads down the T-tubules and "shocks" the sarcoplasmic reticulum into releasing calcium ions.
What ensures that one action potential in the neuron yields only one action potential in the skeletal muscle fibers of the stimulated motor unit and therefore only one contraction per fiber?
sarcoplasmic reticulum
In response to action potentials arriving from the transverse tubulesthe sarcoplasmic reticulum releases?
calcium ions.
What does sarcoplasmic reticulum do?
The Sarcoplasmic Retiulum releases calcium ions that will cause troponin/tropomyosin complex to move. This exposes the binding sites on actin and allows the cross-bridges of myosin to bind to the actin binding sites.
The period of a muscle twitch during which an action potential causes the release of calcium from the sarcoplasmic reticulum is the A stimulatory phase B lag phase C relaxation phase D cont?
D- contraction phase
What organelle releases calcium ions when an electrochemical message moves down a T-tubule?
Terminal cisterns of the sarcoplasmic reticulum through the Rhynodine receptors release calcium into the skeletal muscle cell when stimulated by an action potential.
What transmission of the depolarization wave along the neurons membrane?
Action potential
What change in membrane potential triggers action potential?
depolarization
What is needed besides calcium for contraction to occur?
An action potential. It is the nerve impulse that enters into sarcomeres from the sarcoplasmic reticulum and provides the energy for the calcium ions to briefly bind to the troponin on the actin myofilament to allow for contraction to occur by bringing the Z-lines closer together.
What would happen if acetylcholine was released into a neuromuscular junction?
It attaches to its receptor, and binds. Causes another action potential, (calcium released) and it goes to the T-tubule of the Sarcoplasmic reticulum, and attaches to troponin, which moves the tropomyosin, so the myosin and actin and attach, and cause a muscle contraction.
What change in membrane potential depolarization or hyperpolarization triggers an action potential?
despolarization
What is the rapid change in membrane's potential caused by the deplariztion of a neuron?
action potential
