MAINTAINING LIFE

Necessary Life Functions

What does the the highly organized human body do? Organ systems do not work in isolation

Work together to promote well being of entire body

What does the the highly organized human body do? It is important to identify the most

important organ systems contributing to each function

Necessary Life FunctionsLET’S ACT IT OUT!!Break into groups of 3-4 (We will

need 8 in total) I will come around and assign you

a necessary life functionWork with your group to come up

with a skit to act out your life function

GET AS CREATIVE AS YOU WANT (THINK OUTSIDE THE BOX)

Necessary Life Functions Maintaining Boundaries

“Inside” remains distinct from “outside”

External cell membranes– allows needed substances in and prevents unwanted ones

Integumentary system Prevents organs from drying,

bacteria, and from heat, sunlight, and chemical substances

Necessary Life Functions Movement

Muscular system for locomotion

Skeletal system provides framework that the muscles pull on when moving

Movement of substances Blood, food, urine are propelled

through internal organs cardiovascular, digestive, and

urinary systems

Necessary Life Functions Responsiveness (Irritability)

Sense change (stimuli) in environment and then react

Cut/burn your hand, pull it away

No thought, it just happens!

Nervous system – nerves are most responsive, but all body cells are somewhat irritable

Necessary Life FunctionsDigestion

Break down ingested food into simple molecules and absorb nutrients

Absorbed into the blood

Cardiovascular system – distributes nutrient rich blood

Digestive system

Necessary Life Functions Metabolism

Chemical reactions within the body

ATP production

Digestive and Respiratory systems – make nutrients and oxygen available in blood

Cardiovascular system distributes substances

Regulated by hormones – Endocrine system

Necessary Life Functions Excretion

Removing waste (excreta) from body

Produced during digestion and metabolism

Digestive system – rids the body of indigestible food

Urinary system – disposes nitrogen containing metabolic waste

Necessary Life FunctionsGrowth

Increase in size

Increase in number of cells

Cell constructing processed must occur faster than cell-destroying ones