Homeostasis and Cell Organization Flashcards
What kind of organisms dominate the world?
unicellular organisms
How do unicellular organisms maintain homeostasis?
by growing, responding to stimuli, transforming energy and reproducing
What are some examples of unicellular organisms?
prokaryotes, eukaryotes, and bacteria which are all highly adaptable
Homeostasis
keeping internal chemical and physical conditions relatively constant despite changes in internal and external environments
How do multicellular organisms maintain homeostasis?
They have specialized cells that have particular tasks, which communicate to maintain homeostasis
How are cells in multicellular organisms organized?
Into tissues, organs, and organ systems
Tissues
a group of similar cells that performs a particular function
Organ
a group of tissues working together
Example of organs
heart, lungs. etc.
Examples of tissues
muscles have muscle tissue, connective tissues, etc.
Organ system
group of organs that work together.
Examples of organ systems
Digestive System, Respiratory System, Endocrine System
How do cells in multicellular organisms communicate?
Through chemical signals that are passed through cells. These chemical signals can speed or slow down activities of the cell that receive them
Cellular Junctions
connections between cells which either hold cells together or allow chemical messages to pass directly between the two cells
Receptors
what the signaling molecule binds to. This is what causes important changes in cellular activity.
