AS Level Biology<br />Cardio Vascular system<br />
By the end of this lesson you should know :<br />The function of the heart within the CV system<br />The description of pulmonary and systematic circulation<br />The names of the structures within the heart<br />The functions and location of the semi-lunar and atrio-ventricular valves<br />Outcomes<br />
Function<br />The heart is the primary muscle in the body<br />Beats continuously<br />Provides the tissues and cells with oxygen and nutrients<br />Heart is divided in to four chambers<br />
Four Chambers<br />Top two chambers – atria<br />Lower two chambers – ventricles – more muscular than atria as these are the main pumps <br />Muscular wall in the middle – septum dividing the heart sagitally<br />
Dual Action Pump<br />Left side of the heart – SYSTEMIC CIRCULATION<br />Circulating oxygen rich blood through the body<br />Right side of the heart – PULMONARY CIRCULATION<br />Circulating oxygen poor blood back to the lungs<br />
Major vessels that act as entry and exit points are at the top of the heart<br />To ensure smooth passage of blood through the heart, a number of VALVES exist<br />Valves ensure blood only flows in one direction, and the ‘lub dub’ sound of the heart<br />The ‘lub’ is the sound of the bicuspid and tricuspid valves (atrio-ventricular valves) closing<br />The ‘dub’ sound is the sound of the pulmonary and aortic valves (semi-lunar valves) closing<br />Valves<br />
Heart – Cardiac tissue<br />Thick outside tissue – pericardium<br />Thick muscular wall of the heart – myocardium <br />Inner layer of single cells that line the ventricles – endocardium <br />Muscular composition<br />
Covering the exterior of the heart are coronary arteries<br />These feed the heart with blood<br />Blockages of these arteries are responsible for many heart problems<br />Cardiovascular diseases – hypertension, angina pectoris and myocardial infarctions (heart attacks)<br />Diseases <br />
Place the following terms in correct order to explain the flow of blood through the body, starting with the heart and its path through the body<br />Aorta , left atrium, venae cavae, bicuspid valve, aortic valve, pulmonary valve, pulmonary vein, tricuspid valve, lungs, right ventricle, left ventricle, pulmonary artery<br />Then draw a simple model to illustrate the dual role of the heart, use red lines to show oxygen rich blood and blue lines to show deoxygenated blood<br />Activity<br />
Design a poster to illustrate the function and structure of the heart<br />Include the benefits of exercise to the cardio-vascular system on the poster<br />Homework <br />
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