Circulatory System SBI 3U Ms. Raper. Open circulatory system Found in many insects Blood returns to...
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Transcript of Circulatory System SBI 3U Ms. Raper. Open circulatory system Found in many insects Blood returns to...
Circulatory System
SBI 3U
Ms. Raper
Open circulatory system• Found in many
insects• Blood returns to the
heart via the movement of the animal’s body.
• inefficient
http://fajerpc.magnet.fsu.edu/Education/2010/2010_INDEX.HTM
Closed Circulatory System
• Found in some invertebrates such as worms and in fish, reptiles, birds and mammals
• Blood never leaves a system of tubes
• Heart pumps blood around the body
William Harvey 1568 -1657
• Was a physician trained in Italy.
• Was the first to accurately describe the action of the heart pumping blood around the body.
• He confirmed the presence of valves in the veins to prevent the backflow of blood.
• He confirmed his theories by carrying out dissections. http://www.bbc.co.uk/history/historic_figures/harvey_william.shtml
Blood Vessels• Arteries – carry blood AWAY from the heart.
• Veins – carry blood back to the heart – blood returns VIA the veins.
• Capillaries – CONNECT arteries and veins, it is here that substances are loaded and unloaded into the
blood by diffusion.
http://www.owensboro.kctcs.edu/gcaplan/anat2/notes/Notes5%20Circulatory%20Anatomy.htm
Arteries
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookcircSYS.html
•Thick elastic muscular walls
•Small lumen
•Carry oxygenated blood (except pulmonary artery)
•Carry blood away from the heart.
Veins
• Have thin walls
•Large lumen
•Carry deoxygenated blood (except pulmonary vein)
•Have valves to prevent backflow of blood
•Carry blood back to the heart
Circulatory System
Blood vessels
Arteries
• Have a smaller lumen than veins
• Have thick Muscular walls.• Carry oxygenated blood
(except the Pulmonary artery)• Have a pulse• Carry blood away from the
heart• Have blood under high
pressure• Blood is BRIGHT red• A cut artery spurts with the
heart beat.• Main artery is the AORTA
Cross section through an artery.
Capillaries
• Connect arteries and veins.
• Are found in organs.• Are where substances
are dropped off or picked up from the cells
• Are only one cell thick.• Red Blood Cells must
travel through in single file.
• Low pressure• Cut capillaries ooze Cross section of a capillary
• Veins have thinner muscular walls than arteries,
• Have a large lumen,• Have valves to prevent
backflow of blood• Carry blood back to the heart• Carry deoxygenated blood
(except the pulmonary vein)• Have blood that is DARK red.• Low pressure• A cut Vein will gushes.• Main vein is the VENA CAVA
Blood Vessels.
http://iws.ccccd.edu/mweis/Images/Histology/2402%20histology/Circulatory%20Histo/labeled%20circ%20histo/circ_vessels_av_compare_heading.png
Exchange in Capillaries
Coronary Arteries
http://www.patient.co.uk/showdoc/Pilsinl/112.gif
Peripheral Arteries
http://www.patient.co.uk/showdoc/Pilsinl/101.gif
3 parts to the Circulatory System
• Cardiac - blood supply to and through the heart.
• Pulmonary – blood flow through the lungs.• Systemic – blood flow through the body other
than the lungs and heart.• Because blood flows through the heart twice for
every complete circuit, it is referred to as a DOUBLE circulation.