Cells The Basic Units of Life Chapter 1

Cells: The Basic Units of Life Chapter 1

Organizing Life is Simple ORGANIZING TIME § Years § Months § Weeks § Days § Hours § Minutes § Seconds ORGANIZING LIFE § Ecosystems § Communities § Populations § Organisms § Systems § Organs § Tissues § Cells

Starting out Small……. § Cells: § Smallest unit of life and structure in living things § Convert food to energy § Contain all materials necessary for life § Found in all organisms § Specialize for certain jobs

Cell Examples § § Trillions in our body Chicken egg cell Cancer Cell Red Blood Cell

Inside your intestines: Pseudostratified Columnar Epithelium In pond water: Paramecium

Red Blood Cell

Streptococcus Bacteria

Leukemia (Cancer Cell)

Then Why? § 1. Why do the pseudostratified columnar skin cells from your intestine look like fingers? § 2. Why do the paramecium that live in pond water have tiny hairs around them?

Some answers…. § 1. The lining of your intestine contains pseudostratified columnar cells that are shaped like fingers to absorb food and nutrients. The shape of the fingers increases the surface area available for absorbing nutrients.

Paramecium § 2. Paramecium contain tiny hairs around the cell body to filter and trap nutrient particles in the water.

And Why? 3. Are red blood cells shaped like concave discs? 4. What common illness can a strain of streptococcus bacteria cause? 5. How are leukemia cells different than other healthy cells in our body?

More answers…. § 3. Red blood cells are shaped like concave discs to allow them to carry oxygen and to squeeze through the tiny blood vessels of our body. § 4. Some streptococcus bacteria cause strep throat. § 5. Cancer cells behave differently from other body cells.

Moving up the ladder…. . § Tissues: § Groups of cells that work together to perform a specific job in the body. § Ex: muscle tissue or lung tissue

Tissue Example Cardiac Muscle Tissue

Tissues Make…. . § Organs: § Two or more tissues working together to perform a specific job § Ex: Stomach, lungs

Organs make…… § Systems: § Organs working together in groups to perform a particular job § Ex: Skeletal system, digestive system

Which finally make…. Organisms: Anything that can LIVE on its own Are made up of 1+ cells

Organism Examples