What must humans do to stay alive?
Make a list!
Too Legit to Quit:
Maintaining Life
Maintain Boundaries • Simple part All
organisms must keep what is inside in, and outside out!
• must be able to allow some specific things to move in and out
Movement• Includes:
– Traveling point A to point B
– Moving food– Pumping blood– Moving urine– Manipulating our
surroundings
Selma
Responsiveness
• To sense changes in the environment and be able to respond to it–Nervous cells are
highly responsive (or irritable) but “all cells are irritable to some extent”
Digestion
1.The breaking down of food into simple molecules
2.Molecules absorbed into the blood and used by our cells
Metabolism • The sum of all chemical
reactions!
– Anabolism!
– Catabolism!
– Respiration!
• Oh my!
• Largely regulated by endocrine system (hormone secretion)
Excretion
• Waste removal!–Lots of ways
–Breathing
–Urinate!
–Defecate
Reproduction
• Make new cells
• Make new organism
Growth• Increase in size of
body or body part
–Mr. Ward’s old words of wisdom: Cells divide; they Cells divide; they don’t increase in don’t increase in size!size!
With a group of up to 3
•Defend an argument for which function is the most essential to life!