Heart Rate Regulation

Question 1

Neural control

Answer 1

• Chemoreceptors
• Proprioceptors
• Baroreceptors

Question 2

Chemoreceptors

Answer 2

• Located in the muscles
• Aorta, and carotoid arteries inform the CCC of chemical changes in the blood stream e.g. increased levels of co2 or lactic acid

Question 3

Proprioceptors

Answer 3

• Located in the muscles

* Tendons and joints inform the CCC of motor activity

Question 4

Baroreceptors

Answer 4

• Located in the blood vessel walls

* Inform the CCC of increased blood pressure

Question 5

Intrinsic control

Answer 5

• Temperature changes will affect the viscosity of blood and speed of nerve impulse transmission.
• Venous return changes will affect the stretch in the ventricle walls, force of ventricular contraction and therefore stroke volume

Question 6

Hormonal control

Answer 6

•Adrenaline and noradrenaline are released from the adrenal glands increasing the force of ventricular contraction and therefore SV and increasing the speed of electrical activity through the heart therefore HR.