Factors Affecting

• emotions, excitement or sense of danger, stimulate sympathetic nervous system
• what hormone is secreted when sympathetic stimulated


  adrenaline
• what effect does temperature have


  increase of 1°, increases by 10bpm
• drugs?


  caffeine increases, but beta blockers slow
• high blood pressure?

  stimulates baroreceptors (pressure) which sends impulses and inhibits sympathetic system
• contracting muscles?


  stretch receptors send impulses, so heart rate increases in anticipation of increased metabolic demand