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Homeostasis and Cell Processes

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Jocelyn Langford

on 8 February 2016

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Transcript of Homeostasis and Cell Processes

Homeostasis and Cell Processes
How do cells get energy?
Cells get energy by breaking down materials, such as food in which energy is stored.
Photosynthesis is the process by which plants, alagae, and some bacteria make their own food.
Cellular Respiration: The process by which cells use oxygen to produce energy from food. #9 page 152 (group)
How do cells divide?
Cells grow, divide, and die. (Cells in the skin are constantly dividing to replace those that have died or are damaged.
Inside of a Eukaryotic Cell, before a cell can divie, DNA is copied.
DNA copies are sorted into two new cells.
DNA is packaged into chromosomes.
Equal number of chromosomes are separated, and the nucleus splits to form two identical nuclei.
Balance in Organisms
Unicellular organisms exchange materials directly within its environment.
Multicellular organisms have systems that transport materials to cells from other places in the organism. The main transport system in your body is your cardiovascular system.
The maintenance of a constant internal state in a changing environment
How do organisms maintain homeostasis?
Cells can obtain energy, divide, and trasport materials to maintain stable internal conditions.

Ex: when organisms become cold, the cells respond in order to maintain a normal internal temperature. This is called shivering
How do cells exchange materials?
Passive Transport- The movement of particles across a cell membrane without the use of energy by the cell
Diffusion is the movement of molecules from high concentrations to low concentrations.
Osmosis is the diffsion of water through semi-permeable membrane.
How do cells exchange materials?
Active Transport- The movement of particles against a concentration gradient and requires the cell to use energy.
Endocytosis- The process by which a cell uses energy to surround a particle and enclose the particle in a vesicle to bring the particle into the cell.
Exocytosis- When particles are enclosed in a vesicle and released from a cell.
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