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Comparative Circulatory Systems

Comparative Circulatory Systems. Biology 11 G.Burgess 2006. Circulatory Systems. Nutrients, fluids and metabolic wastes are cycled through an organism’s circulatory system

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Comparative Circulatory Systems

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  1. Comparative Circulatory Systems Biology 11 G.Burgess 2006

  2. Circulatory Systems • Nutrients, fluids and metabolic wastes are cycled through an organism’s circulatory system • Microscopic animal like protists and the least evolved animal species use cyclosis and diffusion to cycle their materials through cells and between cells. • Plants use xylem and phloem to circulate materials between the roots, stems and leaves. • Animals (more complex than the cnidarians/jelly fish) use either an open or closed circulatory system

  3. Open circulatory system • Common among shellfish and arthropods (arachnids and insects) • Heart collects blood from a hemocoel (blood space) • Heart pumps blood through open ducts or tubes to be circulated to the body tissues and bathe them with fluids. • Cycled blood collects in hemocoel to be collected by the heart

  4. Closed Circulatory System • Common among annelids, fish, mammals and many other animals • All blood vessels form a continuous closed circuit • Blood is collected by atria and pumped to body by ventricles • At no time does the blood actually come in contact with other body tissues.

  5. Earthworm Circulation • Closed circulatory system • Blood from the dorsal blood vessel travels to the anterior region and is pumped by 5 aortic arches to the ventral blood vessel • Blood from the ventral blood vessel travels posteriorly • Small tubes connect the ventral blood vessel to the dorsal blood vessel in the posterior region.

  6. Earthworm Circulatory system Dorsal Blood Flow Ventral Blood Flow

  7. Grasshopper Circulation • Grasshoppers have open circulatory system • Their blood bathes their internal tissues • Grasshopper do not have hemoglobin, their blood is green and is called hemocyanin

  8. Grasshopper Circulatory System

  9. Other animals Fish Frog Human

  10. Mammalian Circulation • All mammals have a 4 chambered heart • 2 Atria and 2 ventricles • The atria collect blood from the circulatory system and pump it to the ventricles • The ventricles pump the blood to parts of the body • 2 paths of circulation: • Systemic circulation: pumps blood to and from body tissues • Pulmonary circulation pumps blood to and from the lungs

  11. Bibliography • All images from Biodidac, 2006. http://biodidac.bio.uottawa.ca/

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