Answer: D. Contractility of the heart muscle refers to the force of contraction that this muscle can exert.
Explanation:
The myocardial contractility is ability of the heart muscles to contract. This is achieved by the forces which develop between the contracting muscles caused by the filaments of actin and myosin.
The degree of binding of the muscle filaments dependents upon the calcium ion concentration. These actions are controlled in vivo by the sympathetic nervous system. It is driven by the release of the catecholamine, which is a process which determines the calcium ion concentration inside the cytosol of the muscles of the heart.
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The correct answer for this question is Providing non-rebreather mask
A non-rebreather mask is used in spontaneously breathing clients. Providing an endotracheal tube and mechanical ventilation is beneficial in clients with significantly impaired consciousness. A client who needs ventilatory assistance during resuscitation requires a BVM ventilation with an appropriate airway adjunct and a 100 percent oxygen source.
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