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7.4 Homeostasis and Cells

Homeostasis and Cells

Lori Richardson

on 8 January 2014

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Transcript of 7.4 Homeostasis and Cells

Homeostasis and Cells Chapater 7 Section 4 To maintain homeostasis, unicellular organisms grow, respond to the environment, transform energy, and reproduce. Unicellular Organisms and Homeostasis Homeostasis: An organism's ability to maintain relatively constant internal physical and chemical conditions. The cells of multicellular organisms become specialized for particular tasks and communicate with one another in order to maintain homeostasis. Multicellular Organisms and Homeostasis Prokaryotes, especially bacteria, are remarkably adaptable and live almost everywhere. Many eukaryotes also spend their lives as single cells.

Some types of algae, which contain chloroplasts, are single celled. Heart Cell Nerve Cell Bone Marrow Cell Levels of Organization First Level
Cell Second Level
Tissue Third Level
Organ Fourth Level
Organ System Fifth
Organism Archaebacteria Methanogens The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs, and the intestinal tracts of ruminants. Ancient methanogens are the source of natural gas. Halophiles Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water. Thermophiles Thermophiles are the heat-loving bacteria found near hydrothermal vents and hot springs. Many thermophiles are chemosynthetic, using dissolved sulfur or other elements as their energy source and iron as a means of respiration. Archaebacteria emerged at least 3.5 billion years ago and live in environments that resemble conditions existing when the earth was young.
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