Post-Laboratory Worksheet Additional Questions Exercise 22.11: Ph.ILL.S Lesson 3

Question

Post-Laboratory Worksheet Additional Questions Exercise 22.11: Ph.ILL.S Lesson 31: Cooling and Peripheral Blood Flow 37. Which of the following controls blood flow in a physiologically normal person? A. Radius of the blood vessel B. Blood pressure C. weight of the person D. A and B only are correct E. A, B, and C are correct 38, Cold causes vasoconstriction in the arterioles of the extremities. True False 39. Standing upright from a sitting position increases cardiac output because of reflex interactions with baroreceptors and the sympathetic nervous system. TrueFalse 40. Thought question. Just taking the information you learned in "Blood Pressure and Body Position" into account is a person with chronic high blood pressure at more risk ofa stroke lying down or standing up? Lying downStanding up

Explanation / Answer

37 Ans ) D ( A and B are only correct )

Blood flow in a physiologically normal person depends on 2 factors . 1)Pressure between the ends of the blood vessel 2) resistance to flow

This is based on ohm's law -> Flow = P2-P1/resistance

Resistance depends upon the radius of the blood vessel ( More the radius less will be the resistance )

39 And ) False

When a person stands from a sitting posture the cardiac output decreases . This is because cardiac output = Stroke volume × heart rate . As person stands venous return decreases and cardiac output decreases . To increase the cardiac output there will be reflex increase in heart rate .

40 Ans ) Lying down .

Persons with chronic high blood pressure are at risk of hemorrhagic stroke . Hemorrhage occurs when the blood flow and blood pressure are more . In lying down position the blood flow is more when compared to standing .

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