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BIO 1002 Chapter 27 Homeostasis 7 Organizing Animal Body

BIO 1002 Chapter 27 Homeostasis 7 Organizing Animal Body -...

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Chapter 27: The Homeostasis & Organization of the Animal Body A. Homeostasis : tendency of living things to try and maintain their structure and regulate their internal environment 1. All Living things can do this. 2. Negative Feedback (because you're working against the change): a change in one direction causes a series of events in the other direction to counteract the change *mostly a. Biological: body tem. Of 37 degress C (97.6 F) b. Physical: house thermostat 3. Positive Feedback: initial change in one direction sets off a series of events that intensifies a change in that same direction. a. Biological: population explosion b. Real Life: "snowball" effect c. Oxytocin- hormone made in the brain, sent down to female cervix to induce contractions. Organization of the Animal Body : A. Cells tissues organs organ systems 1. Tissues- cells and or non-cellular components 2. 4 types: a. Epithelial: cells form continuous sheets called membranes, cover body and line all body cavities;
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Unformatted text preview: Forms Barrier- not phospholipid bi-layer b. Connective: surrounded by large quantities of extra cellular substances (between the living cells) which are secreted form the cells of the connective tissue 1) Ex. Dermis, fat cells, blood and lymph, tendons and ligaments, cartilage, bone c. Muscle: tissue specialized for contraction. Cells that contain Actin & Myosin d. Nerve: specialized to generate and conduct electrical signals (form the nervous system) B. Organs-Formed from two or more tissue type 1. Different organs have different proportion of tissue types a. Ex. Skin has all four types of tissue (Fig. 27-10) 1) Epidermis: specialized epithelial cells. 2) Dermis: connective tissue 3) Nerve tissue 4) Muscle tissue 2. Organ systems: a. Consists of two or more organs 1) Examples are: circulatory, digestive, respiratory system (Table 27-1)...
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