The Human Circulatory System

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Presentation transcript:

The Human Circulatory System

Heart

Major Veins and Arteries

Blood Vessels HEART Arteries Veins Arterioles Venules Capillaries

Blood Vessels Arteries Veins Capillaries Elastic, muscular walls Keep blood under pressure Nerve signals can make arteries constrict or dilate Veins Thinner, less elastic, less muscle than arteries Lower pressure than arteries Valves and gravity aid flow back to the heart Capillaries One cell thick Where transfer of gases and nutrients takes place

Blood Plasma (55% of whole blood) Cells (45% of whole blood) Water with dissolved substances Proteins, sugars, amino acids, salts, hormones Variations in concentration Metabolic imbalances Kidney problems Cells (45% of whole blood) Erythrocytes (red blood cells) Hemoglobin carries oxygen Leukocytes (white blood cells) fight infection Platelets Responsible of clot formation (coagulation)

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