Cardiac Conduction: SA Node

What is the primary function of the Sinoatrial (SA) node in the heart?

• Generate electrical impulses and set the pace for the heart's rhythm

• Control the release of hormones in the body

• Regulate blood pressure in the heart

• Filter oxygen in the lungs

Where is the Sinoatrial (SA) node located in the heart?

• Left ventricle

• Pulmonary artery

• Right atrium

• Aortic valve

What is another name for the Sinoatrial (SA) node?

• Heart node

• Cardiac node

• Pulse generator

• Natural pacemaker

How does the Sinoatrial (SA) node contribute to the heart's electrical conduction system?

• The SA node initiates the electrical impulses that regulate the heart's rhythm by generating action potentials.

• The SA node secretes hormones that control heart rate

• The SA node regulates blood pressure in the heart

• The SA node is responsible for oxygenating the blood in the heart

What is the normal heart rate generated by the Sinoatrial (SA) node?

• 80-120 beats per minute

• 60-100 beats per minute

• 30-60 beats per minute

• 40-80 beats per minute

What happens if the Sinoatrial (SA) node fails to function properly?

• Decreased heart rate

• Irregular heartbeats or arrhythmias

• Increased blood pressure

• Improved circulation

How does the Sinoatrial (SA) node interact with the Atrioventricular (AV) node?

• SA node and AV node are not involved in impulse transmission

• SA node delays the impulse, AV node initiates it

• SA node and AV node work independently

• SA node initiates the impulse, AV node delays it slightly before passing it on to the ventricles.

What factors can influence the activity of the Sinoatrial (SA) node?

• Shoe size

• Genetic predisposition

• Autonomic nervous system input, hormones, electrolyte levels, and temperature

• Music preference

What is the significance of the Sinoatrial (SA) node in maintaining heart rhythm?

• The SA node is crucial in initiating and maintaining the heart's rhythm by generating electrical impulses.

• The SA node is only active during rest and sleep

• The SA node is responsible for pumping blood to the rest of the body

• The SA node regulates blood pressure in the heart

How does the Sinoatrial (SA) node coordinate the contraction of the heart chambers?

• The SA node generates electrical impulses that spread through the atria and to the AV node, which then passes the signal to the ventricles, coordinating the contraction of the heart chambers.

• The SA node releases hormones to coordinate heart contraction which then passes the signal to the ventricles, coordinating the contraction of the heart chambers.

• The SA node communicates with the brain to control heart function which then passes the signal to the ventricles, coordinating the contraction of the heart chambers.

• The SA node contracts the heart chambers directly which then passes the signal to the ventricles, coordinating the contraction of the heart chambers.