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chapter 40 outline 2

chapter 40 outline 2 - Chp 40 Basic Principles of Animal...

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Chp 40: Basic Principles of Animal Form and Function Physical requirements constrain what natural selection can invent, including size and shape of animals Convergent Evolution- ex: speedy swimmers have similar shapes; because of natural selection Two layered sacs (hydra) and flat shapes- put large surface area in contact with environment Tissues- groups of cells with a common structure and function. Different types have different structures that are suited to their function Epithelial Tissue Sheets of tightly packed cells Covers the outside of the body and lines organs and cavities within the body Cells of epithelium are closely joined with little material between them. Often riveted together by tight junctions o Tight packing enables it to function as a barrier against mechanical injury, microbes, and fluid loss o Glandular epithelia- absorb or secrete chemical solutions. The glandular epithelia that line the lumen of the digestive and respiratory tracts form a
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