Starter Quiz Heart quiz…

Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

The Conduction System The cardiac muscle is MYOGENIC Myogenic The capacity for the heart to generate its own electrical impulse Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

Conduction System Anatomy Sino-Atrial Node (SA Node) Atrio-Ventricular Node (AV Node) Bundle of His Bundle Branches Purkinje Fibres Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

ECG - Electrocardiogram ECG STAGE Description P Wave PQ Q R S ST T

Heart Conduction Video Describes what happens in each heart beat in terms of blood flow. Each cycle lasts on average 0.8 seconds https://www.youtube.com/watch?v=RYZ4daFwMa8&feature=youtu.be Two key phases Diastole: the heart is relaxed, chambers passively fill with blood (DR) Systole: the heart contracts forcing blood to be moved. Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

The Cardiac Cycle Diastole Relaxation of the cardiac muscle (atria then ventricles) Systole Contraction of the cardiac muscle (atria then ventricles) - Atrial & Ventricular systole Stethoscope time!! Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

Plenary Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

Place the steps in the cardiac cycle in order. Increased ventricular pressure forces open the semi-lunar valves Atrial Diastole: Both atria fill with blood. Bi/Tricuspid valves close preventing backflow of blood Blood flows out of the ventricles via the pulmonary artery or aorta Atrial systole: The atria contact, forcing remaining blood into ventricles Increased pressure forces the bi/tricuspid valves to open Ventricular diastole: the ventricles begin to fill with blood Ventricular diastole: Ventricles contract.

The Cardiac Cycle Atrial Diastole: Both atria fill with blood. Increased pressure forces the bi/tricuspid valves to open Ventricular diastole: the ventricles begin to fill with blood Blood flows out of the ventricles via the pulmonary artery or aorta Atrial systole: The atria contact, forcing remaining blood into ventricles Increased ventricular pressure forces open the semi-lunar valves Ventricular systole: Ventricles contract. Bi/Tricuspid valves close preventing backflow of blood

Starter - Fill in the Blanks Diastole is the phase of the heart. The atria fill with blood opening the and allowing blood to move into the ventricles. Atrial systole is the of the atria forcing blood into the ventricles. is the contraction of the ventricles forcing blood out of the heart to the lungs and body tissues. Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

Fill in the Blanks Diastole is the phase of the heart. The atria fill with blood opening the and allowing blood to move into the ventricles. Atrial systole is the of the atria forcing blood into the ventricles. is the contraction of the ventricles forcing blood out of the heart o the lungs and body tissues. Relaxation Tricuspid Bicuspid Valves contraction Ventricular Systole Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

The HR: The conduction System The SA node fires an impulse Atria Contract. Impulse reaches Atrioventricular(AV) Node AV node distributes impulse to Bundle of His B.o.H passes impulse to Purkinje fibres Ventricles contract Learning Objectives Know what is meant by the conduction system Understand the conduction system and the role it plays Be able to verbally explain the conduction system

Conduction Causes (diastole or systole) Event (Contracts or relaxes) What effect does this have? No electrical impulse SA node fires electrical impulse through the atria walls to the AV node. The AV node delays the response. Bundle of His splits into two and passes into the purkinje fibres in both ventricular walls

Homework Create a cue card game for Friday about the flow of blood around the heart. Annotate the article about Bradley Wiggins