Anatomy Of The Heart And The Conduction System Flashcards
What are the 4 parts of the conduction system
- SA node
- AV node
- Bundles of his
- Purkinje fibres
Which side of the heart is the tricuspid valve situated
The tricuspid valve is situated in the right side of the heart
Which side of the heart is the bicuspid valve situated
The bicuspid valve is situated in the left side of the heart
Where in the heart is the pulmonary semilunar valve situated
The pulmonary semilunar valve is situated between the right ventricle and the pulmonary artery
Where in the heart is the aortic semilunar valve situated in the heart
The aortic semilunar valve is situated between the left ventricle and the aorta
What is the circularity system called where the blood flows from the heart to the rest of the body
The systemic system
What is the circularly system called where the blood is pumped from the heart to the lungs and back
The pulmonary circuit
What is the first step of the conduction system
The SA node in the wall of the right atria sends an impulse across both atria causing atria systole
What is the second step of the conduction system
The AV node - in the middle of the wall between the atria and ventricles - receives the impulse from the SA node for, delays it for 0.1-0.2 seconds while atria systole to finish and then sends it down the bundles of his
What is the third step of the conduction system
The bundles of his - in the middle wall of the heart - send the impulse down to the bottom of the left and right side of the heart
What is the fourth step of the conduction system
The purkinje fibres - in the walls of the ventricles - use the impulse to penetrate the ventricle walls causing ventricle systole
What is systole
Contraction of the chamber walls
What is distole
Distole is the relaxation of the heart chambers
Define the conduction system
The conduction system consists of specialised bundles of tissue that transmit electrical impulses around the heart causing coordinated contractions
