1. Cell Growth and Development

2. Cell Lifespan
The average lifespan of a cell depends on the type of cell it is.
There are approximately 10 trillion cells and 200 different types of cells in an average human body.
Some cells are short lived and some are around from birth until death.
Every minute, an average of 300 million of the body's cells die.
In the vast majority of cases, these cells are quickly replaced by new cells through a process called cell division.

3. Cell Lifespan Cell Type Lifespan White Blood Cell Few hours to a day
Liver Cell
8-16 months
Taste Receptor
10 days
Nerve Cell
Lifetime
Skin Cell
1 month
Muscle Cell
15 years
Red Blood Cell
3 months
Intestinal Cell
2-3 days

4. Cell Division
The formation of new cells is essential for an organism to grow, develop and repair damaged cells and create new organisms.
The process by which one cell divides into two cells = cell division.
2 Types of cell division:
Mitosis – “My toes” cell division is body cells.
Meiosis – “Me” cell division in sex cells.

5. Mitosis
Mitosis = “My toes” or the cell division process that takes place in body cells.
The chromosomes (X) in the nucleus make copies of themselves and produce new cells with 100% of the exact same information.

6. Mitosis
Interphase
Prophase
Metaphase
Anaphase
Telophase

7. Phases of Mitosis – (IPMAT)
Interphase: (I)
Longest stage of cell division
First stage of cell division
Grows to its mature size:
Doubles in size and produces all the structures needed to carry out its functions.
Makes a copy of its DNA – Replication
Now contains two identical sets of DNA.
Prepares to divide into two cells

8. Phases of Mitosis – (IPMAT)
Prophase: (P)
Mitosis Begins!
Chromatin begins to condense to form chromosomes.
Spindle fibers form bridges between the ends of the cells.
Centrioles begin moving to opposite ends of the cell.
Nuclear membrane breaks down.

9. Phases of Mitosis – (IPMAT)
Metaphase: (M)
Chromosomes lineup in the middle of the cell
Chromosomes attach to a spindle fiber at its centromere.

10. Phases of Mitosis – (IPMAT)
Anaphase: (A)
Centromeres split.
Chromatids separate at the centromere.
Cell becomes stretched out as the opposite ends pull apart.

11. Phases of Mitosis – (IPMAT)
Telophase: (T)
Chromatids arrive at opposite sides of cell.
New nuclear membranes begin to form around each new daughter nuclei.

12. Phases of Mitosis – (IPMAT)
Cytokinesis:
Final stage of cell division
The cytoplasm divides.
Cell membrane squeezes together at the center of the cell making two separate daughter cells, each with one nucleus.

13. Identify the Steps? Interphase C Telophase D B Anaphase A Prophase E
Metaphase