Presentation on theme: "The Human Circulatory System"— Presentation transcript:
1 The Human Circulatory System Components and Functions
2 Components of BloodPlasmaRed blood cellsWhite blood cellsPlatelets
3 Plasma Makes up 55% of the blood Contains dissolved ions including; Ca, Mg, Na, HCO3Wastes and nutrientsProteins (antibodies, enzymes, hormones, clot factors)Water (91% H2O)
4 Red Blood Cells Most numerous cells Shaped like bi-concave discs Produced in the bone marrowMature RBC’s do NOT contain a nucleusHemoglobin is an iron-containing protein in RBC’s that binds to O2 and assist in its transport
9 Platelets Assist in the clotting process Fragments, contain no nucleus Made in bone marrow
10 Blood ClottingClotting involves a series of enzyme controlled reactionsInjury to blood vessel-causes platelets to rupture-initiating clotting reactions.Prothrombin-Thrombin-Fibrinogen--Fibrin, which forms a fibrous mesh at the site of the injury.The mesh traps blood cells, forming a clot
12 Transport VesselsBlood circulates through the human body within closed blood vessels
13 Arteries Carry oxygen-rich blood away from the heart to the body Thick, muscular walls to withstand blood pressureRhythmic expansion and contraction of the arteries produced by the heart is called the pulse.
14 Capillaries Smallest branches of arteries One cell layer thick They are the site of exchange of materials between the blood and tissues
15 Veins Blood flows from the capillaries into veins Veins are thin walled and carry oxygen poor blood back to the heartContain valves that prevent backflow of blood due to the low pressure in the veins*Blood flow in the veins is assisted by the contraction of your muscles.
16 Intercellular Fluid and Lymph Some of the plasma leaves the capillaries and bathes the cells. This is called Intercellular Fluid (ICF).Excess ICF is drained into tiny vessels called lymphatic vessels. It is then called lymphatic fluid.Lymph fluid empties into the large veins that return blood to the heart.