what must humans do to stay alive?

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!