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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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∙ 12y ago
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∙ 14y agoBecause your leg needs air.
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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 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.
What is muscle contraction without muscle shortening is what kind of contraction?
Isometric contraction
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.
What is a principal character in a literary work also a muscle which causes movement through contraction?
agonist
Unilateral contraction of which muscle causes ipsilateral flexion of the lumbar vertebral column?
Quadratus Lumborum
