Do multicellular organism have a circulatory system?

Answer 1

Large animals require a circulatory system so that they are able to efficiently distribute materials throughout their body. The circulatory system consists of the heart, blood vessels, blood, lymph, lymph vessels, and associated organs such as the thymus, spleen, and liver. Various functions include: transport of nutrients from the digestive system and storage depots to each cell, transport of oxygen from respiratory structures, transport of metabolic wastes from cells to excretory organs, transport of hormones, helps to maintain fluid balance, distribute metabolic heat, maintain the approprate pH and help defend against invading microorganisms.

Answer 2

Actually many single celled organisms do have a water transport system. The contractile vacuole which can prominently be seen in freshwater paramecium is an organelle that excretes excess water outside the cell.

Answer 3

Single-celled organisms (for example, amoebas, euglenas) do not have a circulatory system because they have only one cell, and materials can easily move around the cell without a special system.

Answer 4

They need a circulatory system in order to transport nutrients and waste out of and into cells.

Answer 5

The circulatory system moves oxygen through the body.

Answer 6

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