Control Of Heart Rate

Question 1

Describe steps for speeding up the heart rate

Answer 1

1. Chemoreceptors (carotid body, aortic body)
2. Nerve impulses
3. Cardiovascular centre in medulla oblongata
4. Nerve impulses
5. Sympathetic nerve
6. Nerve impulses
7. Sinoatrial node or heart
8. Heart rate speeds up

Question 2

Describe the steps for slowing down heart rate

Answer 2

1. Baroreceptors (carotid sinuses, aortic arch)
2. Nerve impulses
3. Cardiovascular centre in the medulla oblongata
4. Nerve impulses
5. Parasympathetic nerve
6. Nerve Impulses
7. Sinoatrial node of the heart
8. Heart rate slows down

Question 3

What is the mode of heart rate resting?

Answer 3

Rest and digest

Question 4

What is the mode of the heart rate increasing?

Answer 4

Fight or flight