Plant Tissue

Chapter 2. Animal Tissues Animals atomic number 18 multicellular heterotrophs whose cells lack cell walls. At some point during their lives, all fleshlys ar capable of bear onment, although non all animals devote muscles they use for this. In the to the highest degree usually encountered animals, the mobile stage is the adult, although some animals (such as corals and sponges) fork up stalkless (or nonmobile) adult phases and mobile juvenile stresss. Both animal and plant evolutionary history show the development of multicellularity and the move from pissing to land (as well as a secondhand modification back to urine, for example dolphins, whales, duckweed, and elodea). Animals developed away or natural skeletons to provide support, skin to prevent or diminish water loss, muscles that allowed them to move in search of food, brains and nervous systems for desegregation of stimuli, and internal digestive systems. Organs in animals ar calm of a number of dif ferent create from raw shove types. For example, the stomach has epithelial thread making linings and secreting gastric juices, connecter create from raw materials. Plants are simpler pipe organisms than animals, having three organ systems and fewer organs than do vertebrate animals. Organs are composed of tissues, which are in turn composed of cells. Plants have three tissue types: ground, dermal, and vascular. Animals have four: epithelial, connective, muscle, and bone. EPITHELIAL TISSUE epithelial tissue is made of closely-packed cells arranged in flat canvasss. Epithelia form the get on of the skin and line the various cavities and tubes of the body. The epithelia that form the home(a) lining of product line and lymph vessels are called endothelia. The apical surface of epithelial cells is exposed to the external environment, the lumen of the organ or the air. The basolateral surface is exposed to the internal environment (ECF). The entire sheet of epithelial ce lls is inclined to a layer of extracellular! matrix that is called the basement membrane or, better (because it is...If you want to get a full essay, erect it on our website: BestEssayCheap.com

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