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Human Circulatory System Revision Notes.

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Introduction

* The circulatory system is responsible for transporting materials throughout the entire body arteries- tubes that carry blood away from the heart veins- tubes that return blood to the heart capillaries- collect them, tiny tubes that exchange food, oxygen, and waste between blood and the body cells pulmonary circulation (lungs)- the movement of blood between the heart and lungs coronary circulation (heart)- the movement of blood from within the heart chambers to the heart tissues themselves systemic circulation (everything else)- the movement of blood between the heart and the rest of the body interstitial fluid- is an isotonic solution which bathes and surrounds the cells of multicellular animals. This fluids fills the spaces in between cells functions: delivery of oxygen delivery of nutrient molecules delivery of hormones removal of carbon dioxide, ammonia and other metabolic waste parts: pulmonary circulation- lungs coronary circulation- heart systemic- the rest of the body 1. the heart 2. the blood 3. the blood vessels Heart: Pump your blood and keep the blood moving throughout your body Beats about 100,000 times in about one day and about 35 million times in a year. ...read more.

Middle

and 40% cells and platelets Plasma- liquid portion of blood Cells and platelets: -red blood cell or erythrocytes -white blood cells or leukocytes -platelets (creates clots) plasma: 90% water and 10% dissolved materials including proteins, glucose, ions, hormones, and gases acts as a buffer, maintaining pH nears 7.4. plasma contains nutrients, wastes, salts, proteins, etc red blood cells: responsible for carrying oxygen and carbon dioxide pick up oxygen in the lungs and transport it to all the body cells after delivering the oxygen to the cells it gathers up the carbon dioxide and transports carbon dioxide back to the lungs where it is removed from the body when we exhale 5,000,000 red blood cells in ONE drop of blood life span Is only 120 days after which they are destroyed in the liver and spleen white blood cells: are larger then erythrocytes have nucleus, but lack hemoglobin they function in the cellular immune response white blood cells are less then 1% of the bloods volume type of WBCs: (five) Neutrophils enter the tissue fluid by squeezing through capillary walls and phagocytozing foreign substances Macrophages release white blood cells growth factors, causing a population increase for white blood cells Lymphocytes fight infection T-cells attack cells containing viruses B-cells produce antibodies! ...read more.

Conclusion

The pulmonary artery carries deoxygenated blood to the lungs arterioles are small arteries that connect larger arteries with capillaries ?small arterioles branch into collections of capillaries known as capillary beds 1. capillaries tiny blood vessels, only 1 RBC fits through at a time capillaries are only 1 cell thick capillaries connect arteries to veins food substances (nutrients), oxygen, waste pas through the capillary walls capillaries on the other hand are so small that it tales ten of them to equal the thickness of a human hair capillaries are thin walled blood vessels in which gas exchange occurs. In the capillary, the wall is only one cell layer thick. Capillaries are concentrated into capillary beds nutrients, wastes and hormones are exchanged across the thin walls of capillaries 1. veins carry blood back towards your heart veins carry blood from capillaries to the heart with the exception of the pulmonary veins, blood in veins is oxygen-poor. The pulmonary veins carry oxygenated blood from the lungs back to the heart venules are smaller veins the gather blood from capillary beds into veins the veins have valves that prevent back flow ...read more.

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