Suppose a person\'s blood pressure is 125/89 mmHg. Calculate the mean actual pre

Question

Suppose a person's blood pressure is 125/89 mmHg. Calculate the mean actual pressure(MAP) for this person. Name the blood vessels of the systemic circuit in order from the highest to the lowest. Identify each of the blood pressure as hypotensive or normal. 86/51, 151/91, 117/79 Severe bleeding can decrease the body's blood pressure. What mechanism causes increase in the body's blood pressure in response to the injury? What do the two numbers in a blood pressure reading represent? If the resistance in a blood vessel is decreased while pressure gradient remains unchanged, how is blood flow affected?

Explanation / Answer

1. MAP = (2d + s ) / 3

Here blood pressure is 125/89, therefore, MAP would be

MAP = (2 x 89 + 125 ) / 3

= 303/3

= 101 mm of HG

2. Vessels of systemic circulation

Left atrium ---> Right atrium ---> Right ventricle ---> Left ventricle ----> Aorta---> Vena Cava---> capillaries in the body

3. Normal blood pressure is 120/80, therefore,

86/51 ----> hypotension

151/91----> hypertension

117/74----> normal blood pressure

4. Severe bleeding causes reduction of body's blood pressure. Temporarily, it can be controlled by the nervous system by changing the blood vessel diameter by the sympathetic and parasympathetic activity by the vasomotor cen-tre. There is a requirement for increasing the blood pressure by increased sympathetic and decreased parasympathetic activity. Baroreceptors are also inhibited. There will be decreased activity of vagus nerve , which results in increase of blood pressure. Increase in heart rate, resulting in vasoconstriction and release of epinephrine and norepinephrine that enhance the heart rate.

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