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What is the main type of nutrient found in calcium?
There are no 'nutrients' in calcium. Calcium is a nutrient. It's essential to muscle movement and it composes most of the mass in bones.
Where are the calcium ions stored in a muscle fiber?
Calcium ions in muscle fibers are stored in the sarcoplasmic reticulum, which is a specialized form of endoplasmic reticulum found in muscle cells. When a muscle is stimulated to contract, the sarcoplasmic reticulum releases calcium ions into the cytoplasm, triggering muscle contraction.
What is done by calcium channel blockers?
Calcium channel blockers block the entry of calcium into muscle cells in artery walls. Muscle cells need calcium to constrict, so reducing their calcium keeps them more relaxed and lowers blood pressure.
Which is not a factor for why your body needs calcium in significant amounts?
*Calcium maintains healthy red blood cells. Calcium is part of a functioning of the nervous system. Calcium is important in blood clotting. Calcium helps forms and maintain bones and teeth.
How does removal of the calcium ions affect the filaments?
Troponin complex will return to its normal configuration and cover the actin binding site on tropomyosin thus preventing further interaction between the actin and myosin filaments, and contraction ends.
What is the all none law of muscle response?
all-or-none law is the principle that the strength by which a nerve or muscle fiber responds to a stimulus is not dependent on the strength of the stimulus. If the stimulus is any strength above threshold, the nerve or muscle fiber will give a complete response or otherwise no response at all
In a recording of a muscle twitch the delay between the time a stimulus is applied and the time the muscle responds is called?
Latent period
When a nerve signals a muscle to contract where is calcium released?
Calcium is released from the sarcoplasmic reticulum inside the muscle cell when a nerve signal triggers the release of calcium ions. This calcium binds to troponin on the actin filaments, which activates the contraction process in the muscle cell.
What is the first phase after a stimulus in a muscle contraction?
The first phase after a stimulus in a muscle contraction is excitation-contraction coupling. This involves the transmission of the action potential along the sarcolemma and the release of calcium ions from the sarcoplasmic reticulum.
Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called?
The short period following the arrival of a stimulus at a skeletal muscle cell is called the latent period. During this time, the muscle cell is preparing for contraction by releasing calcium ions and activating the contractile proteins.
How does the threshold stimulus influence muscle contraction?
The threshold stimulus is the stimulus required to create an action potential. So any stimulus under this level will not cause muscle contraction, while a stimulus above this level will cause the muscle to contract. The higher the stimulus the more muscle fibers are recruited, and thus the higher the response.
When a muscle is stimulated by a nerve impulse what electrolyte is released into the myofibrils calcium oygen potassium sodium?
Calcium
Stimulus at which the muscle first contracts perceptibly?
Threshold stimulus
What does the long refractory period observed in cardiac muscle mean?
it means that no matter what stimulus is applied the cardiac muscle will not be able to contract
What substance is released by the nervous system and excites muscle cells?
Acetylcholine is the neurotransmitter released by the nervous system that excites muscle cells, leading to muscle contraction.
The ability of a muscle to contract and relax is dependent on the flow of what?
The ability of a muscle to contract and relax is dependent on the flow of calcium ions. When a muscle is stimulated, calcium is released from storage sites within the muscle cell, allowing the muscle fibers to slide past each other and generate force. Removal of calcium from the muscle cell leads to relaxation of the muscle.
Which substance is stored in the muscle's endoplasmic reticulum and then released when a nerve signal stimulates a muscle fiber?
Calcium ions
