BIO 224 Lecture Notes - Lecture 1: Conodont, Neural Crest, Paleozoic
8 Mar 2016
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Document Summary
Body plans: primitive vertebrates larger than non-ver. Need more than simple diffusion for most processes. Larger = need more food: also more active. Increased predation (with increased predation, increased size provided protection from predators) More awareness of the environment (moving around more requires the need to navigate environment) Protective integumentary system: first to change was likely respiration. Increased efficiency in o2 extraction permissive for all the rest. Simple brain and eye" (sensitive to light and dark: vertebrates. Complex sensory organs (eyes that can form images: pharyngeal comparisons. Gill arches (cartilage) support slits for respiration. Arches are cartilage (a living tissue that can grow and remodel: feeding comparisons. Discrete liver and pancreatic tissue: excretion and osmoregulation comparisons. Internal coelon filtered by solenocytes via negative pressure. Body fluids same composition as sea water. Ultra-filtration of blood (pulling everything out of the blood, and pull back material that you want to reclaim)
