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Wednesday April 3rd Take out your GOAL WRITING SHEET from yesterday Finish making your Educational, Personal, and Career Goals. If you feel like you are.

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Presentation on theme: "Wednesday April 3rd Take out your GOAL WRITING SHEET from yesterday Finish making your Educational, Personal, and Career Goals. If you feel like you are."— Presentation transcript:

1 Wednesday April 3rd Take 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!!!

2 How do bodies grow? What is happening to our cells when we get old?

3 How does 1 cell become a person?

4 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?

5 Why do Animals shed their skin?

6 YES…We shed our skin too!!!!!

7 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

8 THINK ABOUT IT! What SPECIFICALLY must your cells be doing for healing and growing to happen?

9 Cell Division and The Cell Cycle

10 All Cells come from pre existing Cells. But WHY do cells divide?

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

12 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

13 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

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

15 Bellringer Thurs, 4/4 1.Explain why cells need to be small 2.Give 3 reasons why cells divide 3.What is DNA?

16 Why else do cells divide? Replacement Repair Growth

17 Cell Vocab To Know DNA- 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

18 The Life of a Cell Cell Cycle = sequence of growth & division of a cell 1. Interphase 2. Cell Division Mitosis Cytokinesis

19  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. Interphase

20 2. Cell division Mitosis- cell division creates 2 daughter cells with identical DNA Divided into 4 phases Prophase Metaphase Anaphase Telophase Cytokinesis

21 Bellringer Fri, 4/5 1.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?

22 PMAT Purple Monkeys Attacking Tokyo

23 1. Prophase Chromatin 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

24 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

25 3. Anaphase Sister chromatids are pulled to the opposite ends (poles) of the cell

26 4. Telophase Nuclear Envelope & Nucleolus re-form Chromosomes appear as chromatin again Mitosis ends 2 daughter cells with identical DNA

27 Cytokinesis Division of the cytoplasm Cleavage (pinch) Cell Plate (New Wall) in animal cell in plant cell


29 Interphase Prophase Metaphase Anaphase Telophase








37 Bellringer Mon, 4/8 1.What are the 2 stages of a cell’s LIFECYCLE? 2.What are the 4 phases of MITOSIS? 3.During which phase of mitosis do chromosomes line up in the middle of the cell? 4.During which stage of mitosis are there 2 nuclei with identical DNA? HW #4 due FRI

38 BURNS You can get burned by heat, fire, radiation, sunlight, electricity, chemicals or hot or boiling water.

39 How Burns Affect You First-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.

40 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.

41 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.


43 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.

44 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

45 - 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?

46 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?

47 SKIN GRAFTING From Self (AUTOGRAPH) Thighs Buttocks 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

48 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

49 Bellringer Tues, 4/9 1.What are the three stages of interphase? 2.In what stage of interphase does a cell’s DNA get copied? 3.During which phase of mitosis are the chromosomes pulled to opposite poles of the cell? 4.During which phase of mitosis does the DNA condense into chromosomes, the nuclear membrane dissolve and spindle fibers appear? HW #4 due FRI

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