Life on Earth

Here are some class notes from this week,

• We have muscle tissue and nervous tissue 
• We take in resources (food) then process, then synthesize and eliminate it
• Early lifeforms digest on inside
• Takes food in gizzard, transports, and then eliminates
• All life has that in common, anatomy and physiology
• one celled protists~not animal; fungus or plant
• It can achieve all of this because it lives in H2O
• Sponge has cells that are all in contact with H2O
• They cannot eat because they do not have mouths.
• Cridenians->hydras, corals,->hunt,process...ect
• Extracellular digestion->out of cell in stomach
• Tube within a tube, lines levels of complexity
• Compartalization~digest different things
• From aquatic~to terrestial we needed support.
• Chordata-all animals with abackbone
• You need breathing apparatus
• Need to be able to sense, sense organs->brain, eyes, ect..
• We still have our reptile brain
• Open pumps blood through vessels, many hearts, short life span, and just randomly moves around
• Closed circulatory systems have veins which are better, faster and warmer. Veins move the blood faster.
• Body Symmetry-Amorphic->Sponges, Radial Symmetry->Starfish, Bilateral->cuts at one spot.
• Circulatory-->
• 2 chambered heart-Arteries away from heart-fish
• When they blend~amphibian=O2 rich and O2 poor blood mix
• You're breathing just like a one celled creature, it never changes its just made things more complex.
• Eat=mouth, or can be observed (sponge)
• Process=sack (hydra) stomach or vacoules
• Synthesize= Endoplasmic R., large intestine, or just a digestive system
• Eliminate=back through mouth (hydra), an anus, or a vacoule like object called the anal pore