Circulatory System Bold and Update

Circulatory System Bold and Update - Circulatory System...

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Circulatory System Comparison Living things must able to transport nutrients, wastes and gases to and from cells . Single celled organisms exchange materials by diffusion across their cell membranes. Multi-cellular organisms have circulatory systems to exchange oxygen and carbon dioxide, get rid of wastes and to deliver food to cells. Nonvascular plants such as mosses transport gases, water and waste by diffusion . Vascular plants have transport tubes, xylem and phloem which transport materials. Xylem carries water from the roots upwards and phloem carries food from the leaves throughout the plant. Simple animals, such as the hydra and planaria, do not have ( lack ) specialized organs such as hearts and blood vessels, but use their skin for the diffusion of materials. This type of exchange limits the size an organism can grow . There are two main types of circulatory systems in animals: Vertebrate Heart Comparison Closed Circulatory System Blood is carried in blood vessels of different sizes and
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Circulatory System Bold and Update - Circulatory System...

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