BSC 116 Lecture Notes - Lecture 14: Vasoconstriction, Torpor, Thermostat
22 Mar 2017
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Few cells secreting extracellular matrix: fibers in some kind of foundation. Fibers composed of protein: collagen and/or elastin: 6 major types: Loose connective tissue- bind epithelium, both collagen and elastin: cartilage- collagen fibers in protein-carbohydrate matrix; secreted by chondrocytes, adipose tissue- fat for storage, cushioning, and insulation, blood- liquid matrix. Fibrous connective tissue- dense collagen fibers; tendons and ligaments: erythrocytes- red blood cells for oxygen transport, basophils. Some organisms regulators- maintain (relatively) constant internal temperatures: others conformers- body temperature matches environment, not really a clear dichotomy. Some regulate over certain ranges: regulate some things but not others, use negative feedback loops to regulate: response attenuates stimulus; like a thermostat, there is a set point (or normal range), and deviation leads to correction. Leads to a response: the body"s thermostat is the hypothalamus. Smaller animal has a higher metabolism (heart rate, respiratory rate, etc. : trade-off between size and energy. Small size: tissues more costly, but need less.
