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# When the muscle is in a resting state, thin strands of a protein called tropomyosin are wrapped around the actin filaments, blocking the myosin binding sites. This keeps the myosin from binding to actin. # Molecules called troponin are attached to the tropomyosin. # When calcium is introduced into the muscle cell, calcium ions bind to troponin molecules. # Calcium then pulls troponin, causing tropomyosin to be moved as well, therefore causing the myosin binding sites on the actin to be exposed. # Myosin binds to the now-exposed binding sites. # As soon as the myosin head binds to actin, the head bends at its hinge. # Once the head bends, the myosin loses energy, and remains attached to the actin. # When re-energized by adenosine triphosphate (ATP), the myosin head detaches from the actin filament, and is ready to attach and bend again. # The collective bending of numerous myosin heads (all in the same direction), combine to move the actin molecules closer together. This results in a muscle contraction.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoThe actin (thin) filaments will slide past the myosin (thick) filaments towards the center of the sarcomere.
Wiki User
∙ 12y agoThe H bands and I bands of the sacromeres get smaller.
The zones of overlap get larger.
The Z lines move closer together.
The width of the A band remains constant.
Wiki User
∙ 13y agoit shortens and pulls on the tendons
Khadaija Webb
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What is the muscle's role in the body?
to contract to cause movement.
How does the stretch reflex cause the quadriceps femoris muscle group to contract?
Tapping on the patellar tendon stretches receptors called the muscle spindles in the quadriceps muscle group of the anterior thigh. This stimulus evokes a rapid motor reflex to contract the quadriceps and shorten the muscles. This process is called the patellar reflex.
How does neuronal firing cause muscle contraction?
When a neuron in a muscle is fired, or triggered, it sends a message to the brain telling the muscle to contract.
A weak stimulus can cause a muscle fiber to contract only partway?
yes
Long thin cells in animals that can contract and cause movement?
muscle cells
Any tissue made of cells or fibers that contract and expand to cause movement is an?
Muscle.
What Muscle cause contractions of the heart?
the lungs and the legs contract the heart for regular pulse that murmurs
Is shock from an electric outlet enough to cause pain contract your muscle?
Shock from a standard 110 volt electric outlet can cause pain and contract muscles. An electric shock can cause death. It can also cause severe burns.
Do pinched nerves cause bumps on your back?
Yes. A pinched nerve can cause a muscle to contract. The "bump" that can be felt is actually the center of the tightened muscle. Massage may be used to relax the muscle. Relieving the pinched nerve is of course the better answer.
When a single neuron sends a strong enough impulse to a muscle that how many muscle fibers does it cause to contract?
This will depend upon the number of muscle fibers the nerve innervates. However, all fibers innervated by the nerve should contract in response to the neuronal impulse.
How does muscle cause movement in the body?
The muscles contract and relax to pull tendons that are attached to bones that support our body.
What features do cell have?
muscle contain special proteins called contractile proteins, they contract and relax to cause movement. Muscles are generally of two types (1) voluntary muscle and (2) involuntary muscle.
