14.6 Controlling Heart Rate

Question 1

What system controls heart rate

Answer 1

The autonomic nervous system

The medulla oblongata

Question 2

What are the two centres in the medulla oblongata linked to the sinoatrial node on the heart by motor neurones

Answer 2

One centre investors heart rate by sending impulses through the sympathetic NS - via accelerator nerve

One centre decreases heart rate by sending impulses through the parasympathetic NS - via vagus nerve

Question 3

What are the 2 receptors that pick up the signs to say which system needs to be stimulated

Answer 3

Baroreceptors

Chemoreceptors

Question 4

What do baroreceptors detect

Where are they located

Answer 4

These are pressure receptors
They detect change in blood pressure
In aorta vena cava and carotid

Question 5

What do chemoreceptors detect

Where are they located

Answer 5

These are chemical receptors
They detect changes in level of chemicals like co2
They are in the aorta carotid and medulla