Unit 1: The heart and carraige of oxygen Flashcards
What is the atrioventricular node?
A patch of tissue in the septum of the heart that conducts waves of electrical activity from the atria in the heart through to the Purkyne fibres.
What are the atria?
Upper chambers of the heart.
What is the Bohr effect.?
The effect of carbon dioxide concentration on the affinity of haemoglobin for oxygen.
What is carbaminohaemoglobin?
The molecule resulting from combination of carbon dioxide and haemoglobin.
What is the cardiac cycle?
The sequence of events making up one heartbeat.
What is the cardiac muscle?
The muscle found in the heart. it has it’s own intrinsic heartbeat.(is myogenic)
What are the coronary arteries?
Arteries that carry blood to the heart muscle.
What does deoxygenated mean?
Blood with haemoglobin that carries little or no oxygen.
What is diastole?
The period when the heart muscle in the ventricles is relaxing and blood pressure is at its lowest.
What is a double circulatory system?
A transport system in which blood travels twice through the heart for each complete circulation of the body.
What is an electrocardiogram?
Trace (graph) showing the electrical activity of the heart muscle (atria and ventricles) during a cycle.
What is Endothelium?
A tissue that lines the inside of a structure, such as a blood vessel.
What are erythrocytes?
Red blood cells.
What is fibrillation?
A state in which the chambers in the heart contact out of rhythm.
What is haem?
The iron-containing prosthetic group found in haemoglobin.
