Chapter 40- animal form and function

Chapter 40- animal form and function - o Figure 40.5;...

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Chapter 40 Basic Principals of Animal Form and Function Homeostasis: tendency of living things to try to maintain their structure and regulate their internal environment Figure 40.6 1- negative feedback: a change in one direction causes a series of events in the other direction to counteract the change o Biological: body temp of 37 degrees C (97.6 F) o Physical: house thermostat o All about sensors and effectors (shivering, goosebumps; trying to increase temp) o Hypothalamus Positive feedback: initial change in one direction sets off a series of events that intensifies a change in that same direction o Biological: population explosion o Physical: “snowball” effect o All about sensors and effectors (giving birth) Organization of the animal body Cells, tissues, organs, organ systems Tissues o Cells and/or non-cellular components o 4 types:
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o 1. Epithelial: cells form continuous sheets called membranes, cover body and line all body cavities; FORMS BARRIER
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Unformatted text preview: o Figure 40.5; squamous and columnar o 2. Connective: surrounded by large quantities of extracellular substances (between the living cells) which are secreted from the cells of the connective tissue Dermis (skin), fat cells, blood and lymph, tendons and ligaments, cartilage, bone (central canals which have blood vessels, capillaries) o 3. Muscle: tissue specialized for contraction. Cells that contain ACTIN and MYOSIN o 4. Nerve: specialized to generate and conduct electrical signals Organs o Formed from two or more tissue types o Different organs have different proportion of tissue types o Skin has all four tissue types (figure 40.11) o 1. Epidermis: specialized epithelial tissue o 2. Dermis: connective tissue o 3. Nerve tissue o 4. Muscle tissue Organ Systems o Consist of two or more organs o Examples are? (table 27.1)...
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This note was uploaded on 02/05/2011 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 40- animal form and function - o Figure 40.5;...

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