Nervous control of the cardiac cycle

Which arrow points to the Sinoatrial Node (SAN)?

• D

• F

• A

• H

What is commonly referred to as the hearts 'pacemaker'?

• Bundle of His

• Atrioventricular Node

• Sinoatrial Node

• Purkinje fibres

The process of the heart filling with blood followed by a contraction where the blood is pumped out is called the.........

Tick all that apply to the Sinoatrial node (3).

• Located in the wall of the right atrium

• Located in the centre of the atrium

• Causes the walls of the atria to contract

• Also known as the pacemaker

• It delays the the signal acting as a buffer gate

What is the job of the atrioventricular node?

• Acts as a buffer/gate to slow the signal from the SAN

• Acts as the hearts pacemaker

• Makes the impulse 5x stronger

The atrioventricular node (AVN) acts as a buffer and delays the impulse for approximately ....... to allow the atria to finish contracting

• 0.2 seconds

• 0.3 secons

• 0.5 seconds

• 0.1 seconds

From the AV node the message then runs down the Bundle of His which is located in the....

• Atrial walls

• Aorta

• Septum & atrial walls

• Purkinje fibres

At the end of the Bundle of His there are thin filaments called the .......

The Purkinje fibres distribute the impulse causing the ...................... to contract.

• Atrial walls

• Ventricle

• Atrium

• Septum

What is the direction of the electrical impulse in the cardiac cycle?

• Sinoatrial node - Purkinje Fibres - Atrioventricular node - Bundle of His

• Sinoatrial node - Atrioventricular node - Bundle of His - Purkinje Fibres

• Sinoatrial node - Atrioventricular node - Purkinje Fibres- Bundle of His

• Atrioventricular node- Sinoatrial node - Bundle of His - Purkinje Fibres