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H Bio Unit 9 H-D-F-S
Homeostasis, Diffusion, Feedback Loops & Systems Interactions
| Term | Definition |
|---|---|
| passive transport | Transport across the cell membrane that does not require energy from the cell. Substances move from high to low concentration. |
| active transport | Transport across the cell membrane of a substance against its concentration gradient. Requires energy. |
| concentration gradient | The difference in the concentration of molecules across a space. |
| equilibrium | Concentration of molecules is equal throughout a space. (Molecules remain in motion.) |
| diffusion | The movement of a substance down the substance's concentration gradient (from high to low), in liquids and gases. |
| cytolysis | Cells bursting from excess water pressure inside them. |
| homeostasis | The process by which organisms maintain a relatively stable internal environment . |
| receptor | in a feedback loop, the receptor is the sensory organ that receives the stimulus |
| stimulus | an action that evokes a response |
| effector | in a feedback loop, the effector is an organ or tissue that carries out the response |
| response | the effect, caused by the stimulus |
| positive feedback loop | the output (or product) of a system intensifies the response |
| selectively permeable | some substances can pass through the cell membrane and others cannot |
| solute | the substance being dissolved in a solution |
| solvent | the substance dissolving the solute |
| fluid mosaic model | The phospholipid bilayer behaves more like a fluid than a solid. Lateral movement of the mosaic of lipids and proteins means the cell membrane is constantly changing. |
| negative feedback loop | the output (or product) of a system causes a counter response to return to a set point |
| excretory system | maintains water balance, gets rid of waste like sweat and urine, and filters blood |
| integumentary system | acts as a barrier to protect the body from the outside world, as well as regulates temperature and controls water loss. Includes skin, hair and nails. |
| nervous system | collects, processes and responds to sensory information; controls voluntary and involuntary (reflex) actions |
| endocrine system | produces and secretes hormones for regulation of the body (growth, metabolism, and sexual development) |
| body systems interactions | organ systems work together to maintain homeostasis in multicellular organisms like humans |
Created by:
onceamustang
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