ZOO 2700 Lecture Notes - Lecture 5: Basal Body, Choanoflagellate, Red Algae

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2700
• Professor: Alex Smith

Document Summary

Tissues: specialized: epithelium: polarizes the interior and exterior of the cell (important, connective tissue: cells + ecm. Collagen: connective protein in metazoans, provides structure for most of the life on the planet; probably the most important structural protein in animals. Many differences due to size and the ratio of surface area (sa) to volume (v) The surface is the interface between the organism/cell and its environment. Materials for these reactions have to enter cell across the membrane. Sa of cell controls how much can enter cell. At some point the sa will be too small to allow sufficient materials to enter the cell. The surface is a critical interface between the organism/cell and its environment. Mouse to size of rhino: die; not enough skin surface to keep insides in. Shrew: smallest mammal, cells go into overdrive to keep it warm. Strength scales with the x-sectional area of muscle: cross sectional area= strength but mass increases to cubed.