Science 3rd Mastery

• Circulatory System - Also known as the CardiovascularSytem
• Circulatory System - Consists of 3 components namely: BloodVessel, Blood, and Heart
• Heart - Powerful muscular organ
• Heart is covered with a Thin-Layer called Pericardium
• The Heart has 4 Chambers
• The walls are covered with cardiac muscle or myocardium
• Atria/Atrium - upper thin-walled part of the heart
• RightAtrium - COLLECTS DEOXYGENATED blood from the body
• LeftAtrium - RECIEVES OXYGENATED blood from the lungs
• Ventricles - Lower thick-walled part of the heart
• RightVentricle - pumps DEOXYGENATED blood out of the heart to the LUNGS
• LeftVentricle - pumps OXYGENATED blood out of the heart to all parts of the body
• Valves - prevents the backflow of the blood
• TricuspidValve - located between right atrium & right ventricle
• BicuspidValve/MitralValve - Located between left atrium & left ventricle
• AtrioventricularValve - Separates atrium from ventricle
• SemilunarValve - separates ventricle from artery
• PulmonaryValve - Let the blood pumped from from the heart to the lungs
• AorticValve - Let the blood pumped from the heart to the rest of the body
• The tightening of heart muscles produces the HEARTBEAT or CARDIACCYCLE
• CardiacCycle has 2 parts: Systole & Diastole
• Systole - Contraction of the heart
• Diastole - Relaxation of the heart
• Sphygmomanometer - used for measuring blood pressure
• 120/80 is the normal blood pressure
• Pulse - Wave of contraction transmitted along the arteries
• The normal cardiac cycle at rest is 0.8secs
• BloodVessels - A tube that serves ad the passageway of blood
• BloodVessels has 3 kinds: Arteries, Capilliaries, & Veins
• Arteries - Carries oxygenated blood away from the heart
• Arteries deliver oxygen-rich blood to different parts of the body except pulmonary arteries
• The largest artery is aorta
• Smallest artery is called arterioles
• Veins - carry deoxygenated blood from different parts of the body back to the heart
• Smallest veins - Venules
• Largest Veins - Vena Cava
• 2 Large Veins join the Right Atrium
• Superior Vena Cava - brings the blood from the head & arms
• Inferior Vena Cava - Brings blood from the lower parts of the body
• Blood - Liquid part is called plasma, and suspended in it are blood cells