midterm 1

midterm 1 - What are the advantages that multi-cellular...

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What are the advantages that multi-cellular organisms have? Increases efficiency o Controlled shape o Large size What are the disadvantages o Increased weights and size better support structure necessary o Surface/volume ratio decreases problems with trans port Tissue types o Epithelial Lines inner and outer surfaces o Connective Provides structural support Bones cartilage, adipose (fat), blood o Muscle: Skeletal muscles: voluntary:lines limbs and body trunk Smooth: involuntary; lines blood vessels and internal organs Cardiac: heart; pumps blood o Nervous Process info Physical stimulus electric signal Mechanoreceptor in dendrite of sensory neuron (sensitive to pressure) GP strength of GP AP frequency quicker response Electric Signals o Action Potentials (AP’s) Along the axon (conducts long distances) o Postsynaptic Potentials (PSPs) Localized signals and synapses in post synaptic cell o Generator Potential (GPs) Local signals in sensory neurons Transduces physical stimulus into electrical Explain knee-jerk reaction and the antagonistic pair path way
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midterm 1 - What are the advantages that multi-cellular...

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