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An ATPase is a type of enzyme which converts adenosine triphosphate into adenosine diphosphate and a free phosphate ion.
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What does myosin attach to?
During muscle contraction, myosin cross bridges attach to active sites of ACTIN FILAMENTS.
Neurotransmitter that triggers muscle contraction?
Acetylcholine (ah-Seh-til-KO-leen) is the organic molecule that triggers muscle contractions in humans. Acetylcholine acts on both the central nervous system (CNS) and on the peripheral nervous system (PNS). It is also the principal neurotransmitter in autonomic ganglia.
Muscle beneath the frontalis and the orbicularis oculi?
Muscle located beneath the frontalis and orbicularis oculi is called corrugator muscle. It draws the eyebrow down and wrinkles the forehead vertically.
What shortens during muscle contraction?
Uponmuscle contraction, the A-bands do not change their length (1.85 micrometer in mammalian skeletal muscle) whereas the I-bands and the H-zone shorten.The protein tropomyosin covers the myosin binding sites of the actin molecules in the muscle cell. To allow the muscle cell to contract, tropomyosin must be moved to uncover the binding sites on the actin. Calcium ions bind with troponin-C molecules (which are dispersed throughout the tropomyosin protein) and alter the structure of the tropomyosin, forcing it to reveal the cross bridge binding site on the actin. The concentration of calcium within muscle cells is controlled by thesarcoplasmic reticulum, a unique form of endoplasmic reticulum. Muscle contraction ends when calcium ions are pumped back to the sarcomere. Once Calcium goes back into the sarcoplasmic reticulum, muscle relaxation starts.During stimulation of the muscle cell, themotor neuronreleases the neurotransmitter acetylcholine which travels across the neuromuscular junction (the synapse between the terminal bouton of the neuron and the muscle cell). Acetylcholine binds to a post-synaptic nicotinic acetylcholine receptor. A change in the receptor conformation allows an influx of sodium ions and initiation of a post-synaptic action potential. The action potential then travels along T (transverse) tubules until it reaches the sarcoplasmic reticulum; the action potential from the motor neuron changes the permeability of the sarcoplasmic reticulum, allowing the flow of calcium ions into the sarcomere. The outflow of calcium allows the myosin heads access to the actin cross bridge binding sites, permitting muscle contraction.Source(s):wikipedia "sarcomere"the sarcomere is the functional unit of the muscle cellutube "sarcomere" would give you a visual Do actin and myosin shorten during muscle contraction?
Importance of glucose metabolism and ATP formation?
ATP is considered as the energy currency of cell or life. It store high energy needed to carry out bodily process such as metabolism of biomolecules, synthesis of proteins, lipids, carbohydrates., muscle contraction, transport of molecules across the cell membrane and so on. ATP is presenting in nucleus and cytoplasm of every single cell.
What muscle cell protein acts as an ATPase enzyme?
The muscle cell protein that acts as an ATPase enzyme is myosin. Myosin is responsible for converting chemical energy from ATP into mechanical energy during muscle contraction.
Does the enzyme ATPase occur in the globular portion of myosin molecules?
Yes, the ATPase activity in myosin molecules is located in the globular head region. This ATPase activity is essential for the cross-bridge cycling during muscle contraction, where ATP hydrolysis provides the energy for the myosin head to bind and release actin filaments.
What is the component in muscle tissue that contains the ATPase activity required for contraction?
myosin
What is the role of myosin APT ase in muscle contraction?
Myosin ATPase hydrolyze ATP into ADP+pi and yielding the energy required for muscle contraction.
What is the membrane ATPase and what does it do?
The membrane ATPase is a type of enzyme that uses energy from ATP to transport ions across a cell membrane. This transport process is essential for maintaining proper ion gradients, which are crucial for various cellular functions such as muscle contraction, nerve signaling, and nutrient uptake.
What enzymes do myosin heads have?
Myosin heads contain ATPase enzymes, which hydrolyze ATP to provide energy for muscle contraction. This energy is used to power the movement of myosin heads along actin filaments during the sliding filament theory of muscle contraction.
Why warm up exercises increase myosin-ATPase activity?
Warm up exercises and ATPase activity of myosin determines the speed of muscle contraction. Studies with less warm up show muscle twitching.
What acts as ATPase during the contraction cycle of muscle?
myosin cross-bridges
What terminates a muscle contraction?
"A muscle cell remains contracted until the release of acetylcholine stops and an enzyme produced at the axon terminal destroys any remaining acetylcholine."
Where are the cells that initiate the stimulus for contraction of the heart muscle located?
SA node
What is the most important factor in decreasing intracellular concentration of calcium ion after contraction is?
The most important factor in decreasing intracellular calcium ion concentration after contraction is the active transport of calcium ions out of the cell by the calcium ATPase pump located on the cell membrane. This pump helps in restoring the calcium ion concentration back to its baseline level, allowing the muscle to relax and prepare for the next contraction.
Constant contraction of a muscle is?
constant contraction of a muscle is called the muscle tone
