- Created by: alexcmurphy1
- Created on: 20-09-17 11:24
Myogenic: The capacity of the heart to generate its own impulses.
Sinoatrial node (SA node): A small mass of cardiac muscle found in the wall of the right atrium that generates the heartbeat.
Atrioventricular node (AV node): This node relays the impulse between the upper and lower sections of the heart.
Systole: When the heart contracts.
Bundle of His: A collection of heart muscle cells that transmit electrical impulses from the AVN via the bundle branches to the ventricles.
Purkinje fibres: Muscle fibres that conduct impulses in the walls of the ventricles.
Sympathetic system: A part of the autonomic nervous system that speeds up heart rate.
Parasympathetic system: A part of the autonomic nervous system that decreases heart rate.
Medulla oblongata: The most important part of the brain as it regulates processes that keep us alive such as breathing and heart rate.
Chemoreceptors: Tiny structures in the carotid arteries and aortic arch that detect changes in blood acidity caused by an increase or decrease in the concentration of carbon dioxide.
Baroreceptors: Special sensors in tissues in the aortic arch, carotid sinus, heart and pulmonary vessels that respond to changes in blood pressure to either increase or decrease heart rate.
Proprioceptors: Sensory nerve endings in the muscles, tendons and joints that detect changes in muscle movement.
Adrenaline: A stress hormone that is released by the sympathetic nerves and cardiac nerve during exercise which causes an increase in heart rate.
Stroke volume: The volume of blood pumped out by the heart ventricles in each contraction.
Diastole phase: When the heart relaxes to fill with blood.
Ejection fraction: The percentage of blood pumped out by the left ventricle per beat.
Cardiac output: The volume of blood pumped out by…