Cardiovascular System
When performing cardiopulmonary resuscitation (CPR), why do you use the “heel” of the hand rather than the whole palm and fingers?
A greater force can be exerted by the “heel” of the hand which results in a greater pressure being exerted.
Using the “heel” places a smaller area of the hand in contact with the sternum and hence allows a greater force to be exerted.
The same force can be applied to a smaller area of the sternum which is less able to resist the greater downward pressure.
The resuscitator’s wrist is less likely to be damaged by applying CPR in this way.
The same force can be applied to a smaller area of the sternum which is less able to resist the greater downward pressure.
Maximum force during CPR is determined by the strength of the resuscitator. Maximum pressure in addition depends on minimising the area upon which the force is being applied. The heel of the hand allows a small area to be used.
The same force can be applied to a smaller area of the sternum which is less able to resist the greater downward pressure. Maximum force during CPR is determined by the strength of the resuscitator. Maximum pressure in addition depends on minimising the area upon which the force is being applied. The heel of the hand allows a small area to be used.
Related posts
By what name is the heart muscle known?A. Epicardium
B. Myocardium
C. Pericardium
D. Endocardium
Which statement about cardiac output is correct?
A. Cardiac output is peripheral resistance multiplied by stroke volume.
B. Mean arterial pressure multiplied by peripheral resistance is cardiac output.
C. Cardiac output is heart rate multiplied by stroke volume.
D. Cardiac output is blood volume multiplied by heart rate.
What is “systolic pressure”?
A. The peak pressure in the blood due to contraction of the left ventricle.
B. The minimum pressure in the blood prior to contraction of the left ventricle.
C. It may be obtained by multiplying cardiac output by total peripheral resistance.
D. It is also known as mean arterial pressure.
A statement of Boyle’s law could be:
A. As pressure of a gas increases, its solubility increases.
B. As volume of a gas increases, its pressure decreases.
C. As volume of a gas decreases, its pressure decreases.
D. As pressure of a gas increases, its solubility decreases.
Which of the following is not a type of white blood cell?
A. Leucocyte
B. Eosinophil
C. Erythrocyte
D. Neutrophil
Consider Boyle’s law. If the pressure being exerted on an enclosed volume of gas (at a constant temperature) is increased by 20%, by what percentage would its volume change?
A. Volume would increase by 20%.
B. Volume would increase by 44%.
C. Volume would decrease by 44%.
D. Volume would decrease by 20%.
Through which valve does blood flow when it moves from the left atrium into the left ventricle?
A. The semilunar valve
B. The mitral valve
C. The tricuspid valve
D. The aortic valve
Leave a Reply