  NOW: Read the DIRECTIONS on your worksheet.

START: You have 10 minutes to finish the Flip / Flop.

1.

2.

To be able to explain the basic organization levels of the human body To be able to define Homeostasis and explain why it is important in the body.

Golgi = mailman of the cell!

• What is a cell?

• The smallest unit of life • Prokaryotic cells (bacteria cells) • NO nucleus, no membrane-bound organelles. Has ribosomes.

• Eukaryotic cell (plant and animal cells) • Contains more organelles with specific functions • Golgi Apparatus, Lysosome, Mitochondria, Nucleus, etc

  Every cell in the body acts independently AND as part of a team How does it do this? The body has many different levels of organization

1.

Cells 2.

Tissues: groups of similar cells that all do one job 3.

Organ: group of tissue work together to perform big job like as pumping blood 4.

Organ systems: group of organs that perform a series of closely related jobs (ex. digesting food) 5.

Organism (human!)

   We know the body has a lot of organs that do their own jobs.

But, they all work together to keep the body running smoothly. Keep it balanced.

They work together to maintain HOMEOSTASIS!

  Homeostasis = keeping the inside of the body the stable even when the outside changes. BALANCE (YOU ANSWER) Why is it important

to keep our internal environment

(inside the body) the same? (look at your flip/flop)  All of your cells can only live in a certain range of conditions (pH, temperature, water, glucose/food)

  Body Temperature: what temperature is your body?

  98.6 F. Why doesn ’ t it change?

Because your body works to keep homeostasis Sugar Level: why do all your cells always have enough food?

 Circulatory + endocrine system work to make sure your glucose level is always the same

Enzymes are SUBSTRATE SPECIFIC!

•

Proteins

that

speed up

chemical

reactions

•

Lower activation energy

(energy needed to start a reaction) • Lock-and-key fit: substrate binds to enzyme ’ s active site to work •

Affected by temperature, pH, and how much substrate there is

HOMEOSTASIS CHECK FOR UNDERSTANDING:

If temperature or pH were NOT controlled by the body (if there was no homeostasis), what could happen to the enzymes? (what happens to enzymes when they get too hot!?) Proteins would DENATURE!

Denature = melt / stop working your body would stop working!

  Your body ’ s systems all work together to maintain internal (inside) balance even when the external (outside) environment is changing. This is

HOMEOSTASIS.

During our Physiology Unit we will witness more examples of homeostasis. Always ask yourself:

how do the body systems work together to keep the body running smoothly?