BISC 101 Lecture Notes - Lecture 14: Gastrovascular Cavity, Convergent Evolution, Unicellular Organism
16 Jun 2016
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Document Summary
Adaptations: heritable traits that allow organisms to better survive & reproduce in certain environments. Physical laws: things such as mechanical strength, diffusion, heat exchange. Convergent evolution: result of physical laws that constrain animal adaptations. A way of coordinating organ systems with hormonal and electrical. Materials such as nutrients, gases, wastes and heat. Small unicellular organism & exchange: large sa: small volume, short diffusion distance = exchange is very easy, i. e. single cell amoeba or a hydra (jellyfishes) that are 2 layer cell thick at their gastrovascular cavity. As cell # increases, sa:volume ratio decreases: distance between cells and environment increase. Cells tissue (group of cells that have common form/function) organs (tissues organized into a functional units) organ systems (group of organs that work together) Complex body systems coordinate and control together: example is the endocrine and nervous system. Nervous system: rapid and quick, stimulus dendrites cell body nerve impulse axon target cells.
