Getting to the Heart of the Matter: Communities and Health Systems Strengthening
Getting to the Heart of the Matter…
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Transcript of Getting to the Heart of the Matter…
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Getting to the Heart of the
Matter…
The Circulatory
System
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The Circulatory System
•Components:– Heart – cardiac muscle, involuntary– blood vessels – lined w/smooth
muscles– Blood – is a tissue
•AKA (also known as) - Cardiovascular System – Cardio – means heart– Vascular – means blood vessels
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•The blood vessels of the circulatory system reach throughout the entire body
•Blood flows through these vessels to every organ in the body
•Capillaries reach every cell of the body
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Functions of the Circulatory System
• Carries needed materials to the cells– Oxygen from the lungs – Glucose for energy
• Carries waste products away from the cells– Carbon dioxide (CO2)– Other wastes
• Carries cells that fight disease throughout the body (white blood cells)
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The Heart• The heart is made up
of four chambers (sections)
• Split into left and right side by a muscular wall (septum)
• The heart works with the lungs to provide oxygen to the body
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The Parts of the Heart
• Atrium – the two upper chambers of the heart– Receive blood coming into the heart
• Ventricles – the two lower chambers of the heart– Pump blood out of the heart
• Valve – a flap of tissue that prevents blood from flowing backward– Located between each chamber and in
the veins
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Label the heart on your notes
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How the Heart Works
• The heart muscle relaxes and the atrium fill with blood
• The atrium contract, pushing blood into the ventricles
• The ventricles contract to pump the blood out of the heart and into the arteries
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The Heart Beat
•The sound that your heart makes is the valves between the chambers opening and closing
•lub-dub, lub-dub
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Your heart does not work alone
•Your brain tracks the conditions around you—climate, stress, and your level of physical activity—and adjusts your cardiovascular system to meet those needs
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Regulation of Heartbeat
• The pacemaker regulates the heart beat.–A group of cells located in the right atrium
–Sends signals that make the heart contract
–Constantly receives internal stimuli about the body’s oxygen needs
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Two Loops
• In one loop– blood travels
from the heart to the lungs and back to the heart.
• In the second loop– blood travels
from the heart to the body and back to the heart.
http://www.mikecurtis.org.uk/heart.htm
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First Loop – to the lungs and
back
• Blood from the body enters the right atrium
• Through a valve to the right ventricle
• Out of the right ventricle into the pulmonary artery to the lungs where the blood releases waste gases and picks up oxygen
• L & R atria pump together
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Do right and left seem backward?
• That's because you're looking at an illustration of somebody else's heart
• To think about how your own heart works, imagine wearing the picture on your chest
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Second Loop-to the body and
back
• The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium
• Through a valve into the left ventricle
• The left ventricle contracts, pushing the blood into the aorta eventually to all parts of the body
• L &R ventricles pump together
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Three kinds of Blood Vessels
•Arteries – blood vessels that carry blood away from the heart
•Veins – blood vessels that carry blood back to the heart
•Capillaries – tiny blood vessels capable of exchanging substances between the blood and body cells
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Three kinds of Blood Vessels
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Study Your Notes!!
• You will take a quiz over these notes tomorrow