AS Applied Science AQA Unit 2 Biology Key Terms 2023 Endothelium - Correct Answer Innermost lining of blood vessels.Elastic Tissue - Correct Answer Connective tissue made from elastic fibers that allows stretching (found in the lungs, artery walls, vocal cords) Smooth Muscle - Correct Answer a muscle that contracts without conscious control and found in walls of internal organs such as stomach and intestine and bladder and blood vessels (excluding the heart) Lumen - Correct Answer space within a tubular part or organ, such as the space within a blood vessel Double Circulatory System - Correct Answer When there are two circuits from the heart, it is described as a double circulatory system. The blood passes through the heart twice for a full circulation through the body.Pulmonary Circulation - Correct Answer circulation of blood from the pulmonary artery through the vessels in the lungs and back to the heart via the pulmonary vein, providing for the exchange of gases Systemic Circulation - Correct Answer circulation of blood throughout the body through arteries, arterioles, capillaries, and veins to deliver oxygen and nutrients to body tissues Deoxygenated - Correct Answer containing a higher concentration of carbon dioxide than oxygen Oxygenated - Correct Answer Term for blood with a high oxygen level.Atrium - Correct Answer upper chamber of the heart that receives and holds blood that is about to enter the ventricle Ventricle - Correct Answer a chamber of the heart that receives blood from an atrium and pumps it to the arteries 1 / 2
Coronary Artery - Correct Answer the artery that branches from the aorta to supply blood to the heart Vena Cava - Correct Answer One of two large vessels (superior and inferior) that return deoxygenated blood to the right atrium of the heart.Pulmonary Vein - Correct Answer one of two pairs of vessels carrying oxygenated blood from the lungs to the left atrium of the heart Atrioventricular Valve - Correct Answer A valve in the heart between each atrium and ventricle that prevents a backflow of blood when the ventricles contract.Septum - Correct Answer Divides the right and left chambers of the heart Semilunar Valve - Correct Answer one-way valve between ventricle and vessel; prevent blood backflow; pulmonary [R] & aortic [L] Cardiac Cycle - Correct Answer the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next Diastole - Correct Answer RELAXATION OF THE HEART Systole - Correct Answer contraction of the heart Sinoatrial Node - Correct Answer the heart's pacemaker, located in the wall of the right atrium Purkyne Tissue - Correct Answer specially adapted muscle fibres that conduct the wave of excitation from the Atrioventricular node down the septum to the ventricles.Atrioventricular Node - Correct Answer neurological tissue in the center of the heart that receives and amplifies the conduction of impulses from the SA node to the bundle of His
- / 2