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Transportation: The Circulatory System
Transcript of Transportation: The Circulatory System
How did our circulatory system evolve?
How do organisms transport nutrients/materials throughout their bodies?
What is the difference between an open circulatory system and a closed circulatory system?
How has our circulatory system evolved?
What should we know about the circulatory systems for the dissections?
Animals - Circulatory system
-The simplest of animals can absorb nutrients from their surroundings - sponges!
Fish - 2 chambers
-some plants do not have "vascular" tissue - things like mosses - must grow low to the ground
-vascular tissue - hollow tubes that carry water/minerals/sugars throughout the plant
-this is what allows trees to grow so tall - can transport water and minerals up from the roots, can transport sugars down from the leaves - xylem and phloem
Bacteria, Archaea, Fungi, Protista
-Not to oversimplify these organisms, but mostly they transport materials through absorption - no vascular system or circulatory system
-Most animals either have an open circulatory system or a closed circulatory system
Types of circulatory systems
Open - The open circulatory system is common to molluscs and arthropods. Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a body cavity with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
Closed - Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
Birds and Mammals
3 chambered heart