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Download Circulatory System - Science with Mr. Enns
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Circulatory System How Blood Moves Around! Circulatory System The circulatory system’s main job is to transport substances around the body. 1. Delivers important nutrients to cells. oxygen, glucose 2. Removes waste products from cells. carbon dioxide 3. Transports disease-fighting cells. white blood cells Parts of the Circulatory System The circulatory system is made of 3 parts. Blood Heart Blood Vessels Blood Blood is not just a red liquid! Blood is a complex, living tissue made up of 4 major components. 1. Red Blood Cells (RBCs) Job: to carry oxygen around the body Fact: the donut-shape lets them fit in tight spaces 2. White Blood Cells (WBCs) Job: to fight invading pathogens (germs) Fact: some eat pathogens & others make poisons Blood Blood is not just a red liquid! Blood is a complex, living tissue made up of 4 major components. 3. Platelets Job: stop bleeding by forming “plaques” Fact: they stick together around a wound 4. Plasma Job: a liquid that contains everything else! Fact: contains glucose, nutrients, proteins, etc. Blood How much of each is in blood? Platelets < 1% of blood WBCs 10% of blood RBCs 40% of blood Plasma Makes up 55% of blood Cool Facts About Blood Blood makes up 8% of your body weight. An average adult has 6 litres of blood, equal to three 2-L pop bottles. One drop of blood contains 5 million RBCs. There is 600 RBCs for every one WBC. 1-2 million RBCs die every second. They are continually replaced with new cells. Red Blood Cells are made in bone marrow, mainly in your ribs, sternum and backbone. There are roughly 25 trillion RBCs in the average adult human. RBCs float along with the flowing plasma, but WBCs can move by themselves. Placed end to end, the total length of your blood vessels is 62,000 miles. Lobster blood is blue. The Heart The heart is a vital part of the circulatory system. The heart is a hollow, muscular organ that pumps blood throughout the body. The heart is the size of your fist and located in the center of your chest, behind the rib cage. The Heart The heart’s structure is very important. The heart is really 2 separate pumps in one! The right side pumps deoxygenated blood to the LUNGS R L The left side pumps oxygenated blood to the BODY Right Side Left Side Pumps to the lungs Pumps to the body vena cava pulmonary artery aorta pulmonary vein r. atrium l. atrium valve valve r. ventricle l. ventricle vena cava septum Blood Vessels After leaving the heart, blood travels through blood vessels through your body. There are 3 types of blood vessels: Arteries Capillaries Veins Blood Vessels Arteries - Carry oxygen-rich blood AWAY from heart - Thick, muscular walls and a narrow lumen Capillaries - Tiny tubes that LINK arteries and veins - Thin 1-cell thick walls to let substances pass Veins - Carry oxygen-poor blood TOWARDS the heart - Thin, elastic walls with valves to stop backflow Blood Vessels A comparison of blood vessels: Artery Capillary Vein Two Loops Blood flows through the body in a pattern. The overall pattern is like a figure-8, with two loops coming off the heart Loop 1 Loop 2 Blood moves from the heart to the lungs and back Blood leaves the heart to the rest of the body and back pulmonary loop systemic loop pulmonary loop systemic loop Any Questions?
