Understanding Life: Cells, Systems, and Processes

Science Section 1: Marathon runner was disoriented with very low blood sodium.

Section 2: Cells → tissues → organs → organ systems → organisms. Section 3: Body

systems depend on each other; nervous system controls them. Section 4: Tissues

= groups of cells working together, attached. Section 5: Homeostasis keeps balance; feedback

responds to stimuli. Section 6: Endocrine system uses hormones to keep homeostasis (like temperature).

Section 7: Diabetes = pancreas/insulin problem; insulin lowers blood sugar, glucagon raises

it. Section 8: Photosynthesis and respiration are opposite; plants need both; photosynthesis

needs sunlight. Section 9: 5/6 kingdoms: bacteria = prokaryotic unicellular; others eukaryotic; plants