Wednesday April 3rdTake out your GOAL WRITING SHEET from yesterday

Finish making your Educational, Personal, and Career Goals.

If you feel like you are already finished, LOOK OVER THEM AGAIN AND BE SURE YOU HAVE DETAILED RESPONSES!!

YOU HAVE 8 MINUTES!!!

How do bodies grow?

What is happening to

our cells when we get old?

How does a scrape heal?

When you fall and scrape the skin off your hands or knees, how does your body make new skin cells to replace the skin cells that

were scraped off?

Why do Animals shed their skin?

What Do YOU Want To KNOW??

1.Write down ANY 3 questions you have about your body growing, healing etc.

2.Pick your favorite question and write it on a sticky note.

3.Place the sticky note on the white poster for our class

THINK ABOUT IT! What SPECIFICALLY must

your cells be doing for healing and growing to

happen?

Cell Division and The Cell Cycle

All Cells come from pre existing Cells.

But WHY do cells divide?

Cells DON’T WORK if they are too big or too small-- they need to be ‘just the right size. WHY IS THIS??

Why are Cells Small?

Small cells are efficient because they have a smaller surface to volume ratio

Exchange of oxygen, food and waste across the membrane is more efficient in small cells

As a cell absorbs nutrients and gets larger, the volume of the cell increases faster than the surface area.

Therefore, the demands of the cell (the volume) exceed the ability of the cell to bring in nutrients and export wastes.

Solution? Divide into two smaller cells

Once cells reach a certain size they must divide in order to continue to function.

Bellringer Thurs, 4/4

1.Explain why cells need to be small

2.Give 3 reasons why cells divide

3.What is DNA?

Why else do cells divide?Replacement

Repair

Growth

Cell Vocab To KnowDNA- genetic material

Chromatin= loose DNA, like pasta

Chromosomes = condensed chromatin, they form when cell is ready to divide, look like an X

Chromosomes are made up of 2 sister chromatids held together in the middle by the centromere

The Life of a CellCell Cycle = sequence of growth & division of a cell

1. Interphase2. Cell Division

MitosisCytokinesis

Cell grows, majority of a cell’s life. Has 3 parts:

G1: Cells grow and makes proteins

S: Chromosomes containing DNA are replicated (copied)

G2: Cell prepares for division

1. Interphase1. Interphase

2. Cell divisionMitosis- cell divisioncreates 2 daughter

cells with identical DNA

Divided into 4 phases ProphaseMetaphaseAnaphaseTelophase

Cytokinesis

Bellringer Fri, 4/51.Using at least 2 examples,

explain why it is important to study cell division. Think of reasons cells divide!

2.What are the 4 phases of Mitosis?

PMATPMAT

Purple Monkeys Attacking TokyoPurple Monkeys Attacking Tokyo

1. ProphaseChromatin thickens and

forms into visible chromosomes

Nuclear Envelope & Nucleolus break down

Centrioles (poles) at opposite ends of cell start sending out spindle fibers (fingers) between them

2. Metaphase

Chromosomes line up in the center of the cell

Spindle Fibers attach to the centromere of each chromosome and pulls them in the middle

3. Anaphase

Sister chromatids are pulled to the opposite ends (poles) of the cell

4. TelophaseNuclear Envelope & Nucleolus re-form

Chromosomes appear as chromatin again

Mitosis ends

2 daughter cells with identical DNA

CytokinesisDivision of the cytoplasm

Cleavage (pinch) Cell Plate (New Wall)

in animal cell in plant cell

IInterphasenterphase

PProphaserophase

MMetaphaseetaphase

AAnaphasenaphase

TTelophaseelophase

Bellringer Mon, 4/8

BURNSYou can get burned by heat, fire,

radiation, sunlight, electricity, chemicals or hot or boiling water.

How Burns Affect YouFirst-degree burns are red and painful. They swell a little. They turn white when you press on the skin. The skin over the burn may peel off after 1 or 2 days.

Second-degree burns are thicker burns, are very painful and typically produce blisters on the skin. The skin is very red or splotchy, and may be very swollen.

Third-degree burns cause damage to all layers of the skin. The burned skin looks white or charred. These burns may cause little or no pain because the nerves and tissue in the skin are damaged.

How does your body react to severe burns?

The swelling and blistering characteristic of burns is caused by the loss

of fluid from damaged blood vessels.

In severe cases, such fluid loss can cause shock.

Burns often lead to infection, due to damage to the skin's protective

barrier.

How Does Your Body Heal Burns?

Can Your Body Heal ALL Burns?

First-degree burn:- Soak the burn in cool water for at least 5 minutes. The cool water helps reduce swelling by pulling heat away from the burned skin.- Put antibacterial ointment on the burn- The slow renewal of skin cells will ultimately heal the burn- 3 to6 days

- Soak the burn in cool water for 15 minutes. - Then put on an antibiotic cream. Cover the burn with a dry nonstick dressing- Check the burn every day for signs of infection, such as increased pain, redness, swelling or pus. If you see any of these signs, see your doctor right away. To prevent infection, avoid breaking any blisters that form.-Burned skin itches as it heals. Don't scratch the burned skin. The burned area will be sensitive to sunlight for up to one year, so you should apply sunscreen to the area when you're outside.- 2 to 3 weeks to heal

● Second-degree burn:

How Does Your Body Heal Burns?

Can Your Body Heal ALL Burns?

How Does Your Body Heal Burns?

Can Your Body Heal ALL Burns?

Third-degree burn:- Go to the hospital right away. Don't take off

any clothing that is stuck to the burn. Don't soak the burn in water or apply any ointment. If possible, raise the burned area above the level of the heart. You can cover the burn with a cool, wet sterile bandage or clean cloth until you receive medical assistance.

- Body typically cannot heal this burn on its own. TOO MUCH DAMAGE HAS BEEN DONE….now what?

SKIN GRAFTINGFrom Self (AUTOGRAPH)

ThighsButtocks

Skin Bank (ALLOGRAPH) Donors- frozen or in a solution Temporary ( 1 to 3 wks: immune system recognizes as foreign)

Protect against infection Reduce pain Reduce loss of fluid Allows skin to heal underneath

CEA (cultured epithelial autograft) Living skin cells from patient to grow new skin cells in sheets in a laboratory.  

Synthetic Skin Substitute

What Do YOU Think?

1. What are 3 things you learned that you did not know before?

2. Write down 3 reactions you have to the videos we watched Skin Grafting ReCell Skin Gun

Bellringer Tues, 4/9