3.6.1.3 Control of Heart Rate

Question 1

Where is the sinatorial node found?

Answer 1

At the connection of the right atrium and the superior vena cava

Question 2

Where is the atrioventricular node found?

Answer 2

Between the walls of the two ventricles next to the semi lunar valves

Question 3

What can be increased or decreased in the heart?

Answer 3

The heart rate
The force of ventricular contractions
The stroke volume

Question 4

What does the sinatorial node do?

Answer 4

Causes the heart to speed up or slow down

Causes the atria to contract

Question 5

What does the atrioventricular node do?

Answer 5

Carries impulses from the sinatorial node down to the bottom of the heart
Ventricles contract from the base

Question 6

What determines the speed of the heart?

Answer 6

Receptors which detect activity

Question 7

What connects with the sinatorial node?

Answer 7

The brain

Question 8

What are the receptors involved in controlling the heart rate?

Answer 8

Chemoreceptors: detect changed in the pH due to increasing carbonic acid
Stretch receptors in the muscles
Stretch receptors which monitor blood pressure

Question 9

What are the two receptors connecting the heart and the brain?

Answer 9

Vagus and accelerans