Mrs.Cruz's Biology Class: Ch. 5.3 Regulation of the Cell Cycle

Section 5.3 Regulation of Cell Cycle

The regulation, or control, of the cell cycle is important for healthy cells to grow. Having uncontrollable division results in what we know as CANCER!

Take a look at this video....

Cancer Cells vs Normal Cells

The cell uses Internal and External Factors

External Factors: The cell uses physical and chemical signals to control the cell cycle. When cells get around other cells they stop dividing.

Many cells release chemicals to neighboring cells to begin to divide.

Internal Factors: When external factors bind to cells they cause a response inside the cell. Enzymes and proteins help the cell move through the cell cycle.

Apoptosis: Programmed cell death. When the cell is damaged or it is no longer useful it programs itself to die. This avoids any problem the cell might contain from spreading to neighboring cells.

take a look...

Apoptosis

Uncontrolled Cell Division

Benign tumors: relatively harmless because they clump together and can be removed

Malignant tumors: cancer cells that break away from the tumor and travel to other parts of the body.

Metastasize: Once the malignant tumors break away and travel through the blood stream they appear at other parts of the body

Metastasis

Carcinogens substances that are known to cause or lead to cancer

Is Red Meat Giving You Cancer

Benign Tumor?

Lets review

Section 5.4 Asexual Reproduction

Asexual reproduction is the production of offspring from a single parent. The offspring are, for the most part, genetically identical to each other and to the parent.

Usually seen in prokaryotes. Eukaryotes undergo asexual reproduction through mitosis.

Multicellular organisms undergo a different type of asexual reproduction called known as mitosis, vegetative reproduction, and/or "budding". EX: Starfish, Hydra