What is the mechanism which leads to an increase in heart rate during exercise?
Exercise leads to an increase of CO2 in the blood. This lowers pH as the CO2 binds with water to form carbonic acid. This pH change is measured by chemo-receptors in the carotid arteries. This change then signals to the hypothalamus which then initiates an electrical impulse down the sympathetic pathway to the heart to increase SAN node triggering, leading to an increase in heart contractions.
MB
Related Human Biology A Level answers
All answers ▸If a person has a very poor diet they may have a very low concentration of proteins in the blood. This may cause oedema. Explain Why
Explain how the HPV vaccine produces long-term immunity in individuals.
What are the major parts of a neuron? What are the three types of nerve cells?
Briefly describe the processes of ultrafiltration and selective reabsorption in the nephron