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What part of the skeletal muscle cell releases calcium when stimulated by the tubules?
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What is the significance of the skeletal muscle fiber triad relationship?
The T tubules conduct electrical impulses that stimulate calcium release from the sarcoplasmic reticulum.
What increases the reabsorption of Na when stimulated by aldosterone?
The Na+/K+ ATPase pumps in the renal tubules and intestines.
What is the function of the transverse tubules in muscle activation?
What is the function of the transverse tubules, is it the place where actin and myosin interact or the storage of calcium ions, or to transmit muscle impulses into the cell interior?
What ions are filtered and exchanged in the kidney tubules?
Sodium (Na+) Potassium (K+) Chloride (Cl-) Bicarbonate (HCO3-) Hydrogen (H+) Calcium (Ca2+) Magnesium (Mg2+)
Do casts come from the tubules the calyces or the ureters?
Tubules
What is the significance of the skeletal muscle fiber triad relationship?
The T tubules conduct electrical impulses that stimulate calcium release from the sarcoplasmic reticulum.
Do Smooth muscle cells have t tubules?
no. Only skeletal and cardiac muscles have T tubules.
The action potential is conducted into a skeletal muscle fiber by?
neuromuscular junctions Action potentials conduct down T tubules into skeletal muscles
What increases the reabsorption of Na when stimulated by aldosterone?
The Na+/K+ ATPase pumps in the renal tubules and intestines.
Cardiac muscle cells are like skeletal muscle cells in that?
Cardiac muscle cells are similar because they have striations which are strands of actin and myosin filaments. They also have mitochondria, transverse tubules, and sarcoplasmic reticulum.Cardiac muscle is different from skeletal muscle in that the muscle is branching, with intercalated dicks at the ends of them, store less calcium, the transverse tubules are larger, and their twitches are longer. Also, the entire cardiac muscle contracts as a whole, regulates itself, and is rhythmic.
What is the role of the tubules?
What is the function of the transverse tubules, is it the place where actin and myosin interact or the storage of calcium ions, or to transmit muscle impulses into the cell interior?
What period is characterized by calcium ions release into cytosol and depolarization of the sarcolemma and T tubules?
The period that would be characterized by those things would be muscle contraction. Calcium ions are the neurotransmitters that cause contraction. Calcium Ions depolarize the cell and are spread through out the muscle via the T tubules.
What is the sequence of structures that action potentials must move through to excite skeletal muscle contraction?
Excitation begins as a motor neuron transmits an action potential to the neuromuscular junction where it gets propagated along the muscle cell. This action potential is an electrical impulse that depolarizes the muscle cell membrane, the sarcolemma, which then releases ions in the sacroplasmic reticulum and transverse tubules. When this happens calcium is released into the sarcomeres that contain actin and myosin myofilaments. The calcium unlocks the binding sites and creates crossbridges with the globular heads on the mysoin fibers. With ATP as the energy source, this crossbridging brings the Z-lines closed together and the muscle fiber contracts.
What does sarcoplasmic reticulum do?
The Sarcoplasmic Retiulum releases calcium ions that will cause troponin/tropomyosin complex to move. This exposes the binding sites on actin and allows the cross-bridges of myosin to bind to the actin binding sites.
What are calcium ions stores as in muscle cells?
sarcoplasmic reticulum, i think. either that are T tubules
Is clacium freely moving through the syctoplasm in a resting skeletal muscle?
It's stored inside the longitudinal tubules of the sarcoplasmic reticulum.
When is calcium pumped into the sarcoplasmic reticulum?
When Ach enters the synaptic cleft (gap) it open chemically gated sodium channels that starts an action potential spreading through the sarcolemma of the myofibril. This action potential spreads down the T-tubules and "shocks" the sarcoplasmic reticulum into releasing calcium ions.
