Question | Answer |
What does CCC stand for? | Cardiac control centre |
Where is the CCC? | In medulla in brain |
What are the two parts to the autonomic nervous system? | Sympathetic and parasympathetic |
What part of the autonomic nervous system sends signals to decrease heart rate? | Parasympathetic via the vagus nerve |
What part of the autonomic nervous system sends signals to increase heart rate? | Sympathetic via the accelerator nerves |
Name three neural factors that inform the CCC when heart rate needs to in/decrease | Baroreceptors / Proprioceptors / Chemoreceptors |
What are intrinsic factors which affect heart rate? | Temperature increases HR increases / Venous return increase HR increases |
Where are proprioceptors found and what do they detect? | In muscles and tendons / movement |
What are Baroreceptors and where are they found? | Found in walls of vena cava and aorta and detect increase in blood flow and blood pressure (stretch receptors) |
What do chemoreceptors detect? | increase in blood acidity |
What are intrinsic factors which affect heart rate? | Temperature increases HR increases / Venous return increase HR increases |
What do thermoreceptors detect? | Changes in temperature |
What does adrenalin do? | • Increasing heart rate & strength of contraction
• Constricting blood vessels
• Increases blood glucose by stimulating the break down of glycogen |