Question

Exercise causes an increase in heart rate.   Describe the role of receptors and of the nervous system in this process.  [4 marks]

Accepted Answer

1. Chemoreceptors detect rise in CO2/H+/acidity/carbonic acid/fall in pH OR

Baro/pressure receptors detect rise in blood pressure;

2. Send impulses to cardiac centre/medulla;

3. More impulses to SAN;

4. By sympathetic (nervous system for chemoreceptors/CO2)

OR

By parasympathetic (nervous system for baro/pressure receptors/blood pressure);

Front	Exercise causes an increase in heart rate. Describe the role of receptors and of the nervous system in this process. [4 marks]
Back	1. Chemoreceptors detect rise in CO2/H+/acidity/carbonic acid/fall in pH OR Baro/pressure receptors detect rise in blood pressure; 2. Send impulses to cardiac centre/medulla; 3. More impulses to SAN; 4. By sympathetic (nervous system for chemoreceptors/CO2) OR By parasympathetic (nervous system for baro/pressure receptors/blood pressure);

System Receptors Detect Rise Or Baro/Pressure Impulses Nervous