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What effect do calcium slow channels have on shortening or lengthening the contraction of the heart muscle?
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Role of ionic calcium in muscle contraction?
triggers neurotransmitter secretion, removes contraction inhibitor, and binds with troponin.
A calcium ion channel will allow?
Only calcium ion channels to pass through it.
What is the most important factor in decreasing intracellular concentration of calcium ion after contraction is?
active transport of calcium into the sarcoplasmic reticulum
What would occur if the uptake of calcium ions was blocked in the sarcoplasmic reticulum?
Sustained muscle contraction.
How is calcium used in muscle contraction?
Calcium binds to troponin, which moves the tropomyosin out of the way so that myosin can bind to actin; this ultimately causes a power-stroke.
What effect do calcium slow channels have on shortening or lengthinging the contraction time of the heart muscle?
They cause long refractory period
What is contraction of muscles?
"Muscle contraction begins with an electrical nerve impulse that results in a release of Ca2+ ions into the myosin-actin structure. The calcium ions in turn produce conformational changes that result in the sliding of the threads through each other, shortening the myosin-actin structure. The collective effect of this process is the contraction of the muscle."
What minerals are needed for normal muscle contraction?
Calcium
What ion is essential for a muscle contraction to occur?
Calcium binding to actin-myosin causes contraction. The calcium is released to the sarcomere from a specialized storage organelle, the sarcoplasmic reticulum.
Where is calcium stored in a relaxed skeletal muscle?
yes calcium is stored in muscles as it is necessary for muscle contraction and muscle contraction is very sensitive to the amount of calcium
What is an important ion for muscle contraction?
calcium
What specific event initiates the contraction?
The specific event that initiates a muscle contraction is the release of calcium ions within the muscle cell. This triggers a series of chemical reactions that ultimately lead to the sliding of actin and myosin filaments, resulting in muscle contraction.
During muscle contraction calcium attaches to what?
Troponin
Excitation-contraction coupling requires what?
Calcium and ATP
Which ion directly controls the contraction of muscles?
calcium
What ion is necessary for cardiac contraction to occur?
calcium is te most important ion in cardiac contraction , whereas the contraction starts by the Na .
What is the role of calcium ions in muscle contraction?
They bind to regulatory sites on troponin to remove contraction inhibition
