Answer:
The correct answer to the question: The safe residual pressure is always:___, would be: 200 psi.
Explanation:
Portable oxygen that is placed in cylinders has become a great resource for people who are oxygen dependent, but wish to maintain a certain level of independence. However, it is important to understand that these cylinders must be managed in accordance with series of factors, and variables, that will make the use of them safe por a patient. One such really important variable is the residual pressure within a cylinder, which means the pressure exerted by the oxygen available still in the cylinder as it flows. Universally it is accepted that the minimum level of this residual pressure must be 200 psi (pounds per square inch) and once it reaches here it means that once that levels has been reached, it is no longer safe to use that cylinder anymore.
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Answer:
Option). about 20 percent of the calcium ion required for contraction comes from outside the cell.
Explanation:
Calcium ions play an important role in cardiac muscle physiology. Calcium ions influx is responsible for plateau phase after depolarization. Calcium ions also play role in muscle contraction with the help of troponin (regulatory protein).
For contraction, about 20 percent of calcium ions are supplied from outside of the cell, while rest of the calcium ions are released from SR (sarcoplasmic reticulum).
Thus, the correct answer is 'forth option.'
