If the radius of blood vessels of a person decreases his/her blood pressure will (1) increase (2) decrease (3) remain unaffected (4) increase for males and decrease for females

If the radius of blood vessels of a person decreases his/her blood pressure will (1) increase (2) decrease (3) remain unaffected (4) increase for males and decrease for females
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(1) increase Explanation: An obese person has a greatly increased number of blood vessels because of the amount of adipose tissue that must be serviced. As a result, the total length of his or her vascular tree is greatly increased and this person tends to have a higher blood pressure because of the greater resistance to blood flow. Resistance is inversely proportional to the fourth power of the radius of the blood vessel. In other words, the smaller the diameter of the vessel, the greater the resistance it offers to blood flow.
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