Question

please answer 1 & 2 thanks!

1) HR and BP responses to submaximal exercise. For this, take a few minutes and do a slight job, walk upstairs or some other moderately strenuous activity. Take your heart rate, and describe what else you believe is happening with the circulatory and respiratory system, and why?

2) What role does the circulatory and respiratory system play in maintaining homeostasis, mainly temperature and pH balance

Answer 1

1. HR and BP spiked way up while climbing upstairs which actually involves single-leg squats along with cardio, The HR increases upto 7 b·min ^-1. The skyrocketing increase of BP and HR is due to increased oxygen demand by the muscles which makes the heart to pump harder. The increased flow also increases the systolic pressure to rise to between 160 and 220 mm Hg .

2. Temperature homeostasis is maintained by the contribution of cardiovascular and respiratory system. Temperature is sensed by thermoreceptors of skin. When there is an increase in temperature, vasodialtion ensures increased blood flow accompanied by circulatory system,allowing more blood to flow near the skin's surface and deccipation of heat and sweat evaporations.

Chemoreceptors are located in close proximity to the baroreceptors detects the ionic change. During active state as result of oxygen levels fall and carbon dioxide levels rise increases RR causes more production of hydrogen ions leads to pH drop.

When pH drops the chemoreceptors respond by increasing cardiac output and constricting peripheral vessels enable more blood to flow. Increasing pH causes decreasing cardiac output, peripheral vasodilation and hence poorer circulation.