Levels of Organization From Cells to Organisms 7.3.3 e2

Cells Plant Cell Complex cells. In multicellular organisms Bacteria Cell Simple cells. Single-celled organisms Animal Cell Complex cells. In multicellular organisms

Definition: structure within the cell that has a specific role. Organelle Definition: structure within the cell that has a specific role.

Organelles & Functions Cell membrane: Surrounds the cell; Function: control what goes in and out of the cell and hold all the cell’s contents together. Is semipermeable or selectively permeable, meaning that some things can cross the membrane, but some things cannot.

Organelles & Functions Cell nucleus: control center of the cell; Function: contains the cell’s genetic information that controls all the activities of the cell. Mitochondria: has ‘ruffled’ inner membrane; Function: provides the energy needed to power the cell - converts food/sugars into energy. Organelles & Functions

Organelles & Functions Chloroplast: found in plant cells only; Function: make sugar/food through photosynthesis. Cell wall: rigid outer barrier of plant. Function: supports and protects the cell.

Definition: a group of similar types of cells that work together to carry out specific tasks. Four main types of tissues in animals: Epithelial Connective Nervous Muscle Tissues

Epithelial Covers surface of the body and lines body cavities Examples: forms glands; outer layer of organs, skin. Function: protection, structure

Connective Function: Provides structure and support; often connects other types of tissue together. Supporting framework. Examples: bones, fat, tendons, ligaments, cartilage

Nervous Function: Communication. Reacts to stimuli; carries messages to and from brain. Examples: Makes up brain, spinal cord and nerves.

Muscle Function: Movement through contraction of muscle fibers. Can be attached to bones (skeletal); in the heart (cardiac); in the walls of organs such as in the digestive tract (smooth)

Plant tissue types Dermal tissue: provides protection and helps reduce water loss. Ground tissue: storage and support, is where photosynthesis takes place. Vascular tissue: moves water and nutrients through a plant.

Definition: a group of different tissues working together to perform a particular job. Examples include the stomach, intestines, heart, lungs, skin, bones, kidneys and liver. We will be going through these in class. Organs

Organ Systems Group of organs that work together and perform a specific task. In each box, write the main organs in that system, and the function of the system.

Integumentary System Respiratory System Made up of: skin, hair Function: Exterior protection Respiratory System Made up of: lungs, trachea, diaphragm Function: Take in oxygen (O2), release carbon dioxide (CO2) – gas exchange

Digestive System Skeletal System Made up of: stomach, intestines Function: Breaks down food-nutrients Skeletal System Made up of: skeleton Function: Structure and support

Muscular System Nervous System Made up of: muscles Function: Movement Made up of: brain, sense organs, nerves Function: Carry and interpret messages

Endocrine System Circulatory System Made up of: thyroid, pituitary Function: Regulate hormones Circulatory System Made up of: heart, arteries Function: Circulate blood

Immune & Lymphatic System Made up of: Appendix, lymph nodes Function: Maintain health Excretory System Made up of: kidney, colon Function: Remove waste

Put the systems together? We get an organism! Definition: something that has all the characteristics of life Characteristics of life include movement, growth and development, reproduction, use of energy, cellular structure and chemical makeup, response to stimuli