Open QuestionYou are babysitting two children who are having a contest to see who can hang upside-down for the longest time. At the end of the contest, both children feel dizzy and are worried they are sick. Explain to them why they feel this way and why the effect is only temporary. (Hint: Consider how the baroreceptor reflex responds when a person hangs upside-down.)
Open QuestionThe Agawam High School band is playing some lively marches while the coaches are giving pep talks to their respective football squads. Although it is September, it is unseasonably hot (88°F/31°C) and the band uniforms are wool. Suddenly Ryan, the tuba player, becomes light-headed and faints. Explain his fainting in terms of vascular events.
Open Questiona. Define blood pressure. Differentiate between systolic and diastolic blood pressure.b. What is the normal blood pressure value for an adult?
Open QuestionJolene awakens suddenly to the sound of her alarm clock. Realizing that she is late for class, she jumps to her feet, feels light-headed, and falls back on her bed. What probably caused this reaction? Why doesn't this happen all the time?
Open QuestionMultiple ChoiceMore than one choice may apply.An increase in BP would be caused by all of the following excepta. increase in SV.b. increase in heart rate.c. hemorrhage.d. vasoconstriction of the arterioles.
Open QuestionJohn is a 30-year-old man who is overweight and smokes. He has been diagnosed with hypertension and arteriosclerosis. Define each of these conditions. How are they often related? Why is hypertension called the 'silent killer'? Name three changes in your lifestyle that might help prevent cardiovascular disease in your old age.
Open QuestionMrs. Rees is brought to the emergency room after being involved in an auto accident. She is hemorrhaging and has a rapid pulse that can barely be felt, but her blood pressure is still within normal limits. Describe the compensatory mechanisms that are maintaining her blood pressure in the face of blood loss.