Ryan Runner is a track athlete who has recently been selected to compete at the 2010 Commonwealth Games. At rest, his heart rate is 50 beats per minute, and his stroke volume is 110 mL. During competition, Ryanâs heart rate increases to 200 beats per minute, and his cardiac output increases 6-fold.
a)Explain how the distribution of cardiac output to the skeletal muscle changes during intense exercise, and the mechanism by which this occurs.
b)Briefly explain how the O2 levels in Ryanâs muscles change during a race. What mechanisms does the body use to meet this altered demand for O2 during exercise?
c)Itâs the day of the 800m final at the Commonwealth Games. Ryan is nervous about the upcoming race, causing his adrenal glands to increase their secretion of adrenaline. Which receptor subtype binds adrenaline at the liver? d)Name TWO (2) effects this would have on the liver.
Ryan Runner is a track athlete who has recently been selected to compete at the 2010 Commonwealth Games. At rest, his heart rate is 50 beats per minute, and his stroke volume is 110 mL. During competition, Ryanâs heart rate increases to 200 beats per minute, and his cardiac output increases 6-fold.
a)Explain how the distribution of cardiac output to the skeletal muscle changes during intense exercise, and the mechanism by which this occurs.
b)Briefly explain how the O2 levels in Ryanâs muscles change during a race. What mechanisms does the body use to meet this altered demand for O2 during exercise?
c)Itâs the day of the 800m final at the Commonwealth Games. Ryan is nervous about the upcoming race, causing his adrenal glands to increase their secretion of adrenaline. Which receptor subtype binds adrenaline at the liver? d)Name TWO (2) effects this would have on the liver.
