Biology

Biology, 16.07.2019 17:10, andres2865

You take a human smooth muscle cell and block the release of calcium from the sarcoplasmic reticulum. what effect does that have on contraction of that smooth muscle cell

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Medicine, 18.07.2019 00:30, tonimgreen17p6vqjq

Arrange the following statements in the proper sequence to describe the contraction mechanism in a skeletal muscle fiber. a. depolarization occurs, and the action potential is generated. b. the muscle fiber relaxes and lengthen. c. the calcium ion concentrations at the myofilaments increase; the myofilaments slide past one another, and the cell shortens. d. the action potential, carried deep into the cell by the t tubules, triggers the release of calcium ions from the sarcoplasmic reticulum. e. the concentration of the calcium ions at the myofilaments decreases as they are actively transported into the sarcoplasmic reticulum.

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Health, 23.07.2019 04:20, brianna4455

In cardiac muscle, calcium ions do not bind to troponin molecules. calcium ions are not released from the sarcoplasmic reticulum. calcium ions play an important role in repolarizing the membrane after the depolarization phase. about 20 percent of the calcium ion required for contraction comes from outside the cell. calcium ions play no role in the process of contraction.

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Biology, 23.07.2019 14:00, obliviousho2018

Part c - how an action potential affects ca2+ movement in a muscle cell the sarcoplasmic reticulum is a specialized form of er that surrounds each myofibril. the sarcoplasmic reticulum functions to control cytosolic ca2+ levels in the muscle cell. changes in cytosolic ca2+ concentrations couple action potentials to muscle contraction. the concentration of ca2+ ions in the sarcoplasmic reticulum is typically much higher than the ca2+ concentration in the cytosol. this concentration gradient is key to the movement of ca2+ in the muscle cell in response to an action potential. the cycle diagram below shows the sequence of events that affect ca2+ levels in a muscle cell, beginning with the propagation of an action potential down a t tubule (top of the diagram). drag the labels to their appropriate locations on the cycle diagram below. note that sr stands for sarcoplasmic reticulum.

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Biology, 01.10.2019 01:30, jessicaisbaehood

What causes the release of calcium from the terminal cisternae of the sarcoplasmic reticulum within a muscle cell?

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