, Organism size
• ↑ size = ↑ no. cells required to perform a
function
• Cells differentiate & specialize to perform
certain functions
, 4 types of mammalian tissues
• Epithelial (squamous; stratified; columnar;
ciliated; glandular)
• Connective (areolar; dense [e.g. tendons];
cartilage; bone; blood; lymph)
• Muscle (striated; unstriated; cardiac)
• Nerve
, Epithelial tissue
• = specialized to form body coverings & lining
of the body cavity & tubes; have no blood
vessels nor direct blood supply; cells closely
packed & cemented together by a lymphatic
substance