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Muscle contraction in initiated by an action potential sent from the brain or spinal cord to the axon terminal of a motor neuron. Calcium then goes into the axon terminal which causes the release of the neurotransmitter acetylcholine which binds to receptors on the plasmalemma. Calcium then diffuses into the sarcoplasm and binds to troponin. The troponin is then shifted to expose binding sites on the actin filament allowing for the linkage of actin and myosin. The the actin filaments are then pulled inward during shortening the sarcomere and resulting in muscular contraction :) I learnt this stuff in year 9
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A contraction that causes a muscle to lengthen rather than shorten is called?
An eccentric contraction is one that causes a muscle to lengthen.
What causes muscle contraction in the leg?
Muscle contraction in the leg is caused by the interaction between nerve signals from the brain and the muscle fibers. When the brain sends a signal to the muscle, it triggers the release of calcium ions, which then bind to proteins in the muscle fibers, leading to the contraction of the muscle.
What type of muscle is capable of rapid contraction and causes skeletal movement?
Skeletal or voluntary muscle is capable of rapid contraction and is responsible for skeletal movement.
What conditions cause contractions of arteriole smooth muscle?
Asthma causes contraction of the bronchial smooth muscle.
Contraction of a muscle resulting in its shortening?
A muscular contraction that causes a muscle to shorten is called a concentric contraction. A concentric contraction is a type of isotonic contraction.
Contraction of the ciliary muscle causes the lens to bend the light less?
false
What type of cellular respiration causes muscle contraction?
Aerobic cellular respiration produces energy for muscle contraction but this is not what causes the contractions. The binding properties between the proteins actin and myosin are what give muscles the ability to contract.
Does contraction of the dartos muscle cause elevation of the testes?
No, contraction of the dartos muscle causes wrinkling of the scrotal skin to regulate temperature, but it does not directly cause elevation of the testes. Elevation of the testes is primarily controlled by the cremaster muscle.
What initiates the contraction of cardiac muscle?
The contraction of cardiac muscle is initiated by electrical signals from the heart's natural pacemaker, the sinoatrial node, which causes the muscle cells to contract in a coordinated manner, pumping blood throughout the body.
What is a reflect muscle?
It is a muscle reflex. A very fast, involuntary muscle contraction. Because of this, it causes you to jerk your hand away after touching a hot iron.
Constant contraction of a muscle is?
constant contraction of a muscle is called the muscle tone
Whats the name of the chemical in the muscular system that causes contraction?
There's more than one chemical that causes contraction. The neurotransmitter (usually acetylcholine) is released from the nerve and excites the muscle. There is a change in calcium, sodium and potassium ion concentrations. ATP is used. All of these work together to produce a muscle contraction.
