Chapter 5 Homeostasis and Cell Transport. What is homeostasis?. Homeostasis is the ability to maintain normal internal conditions. This means maintain a state of balance in living things. Cells must maintain homeostasis. What structure does a cell have to help it maintain homeostasis?.
Homeostasis is the ability to maintain normal internal conditions. This means maintain a state of balance in living things.
Cells must maintain homeostasis
1. Semi/Selectively permeable (controls what substances enters and leaves the cell)
2. Helps organisms maintain homeostasis
If a membrane allows a substance to pass through, it is said to be permeable to that substance.
If a membrane does not allow a substance to pass through, it is said to be impermeable to that substance.
Through the movement of different molecules through the cell membrane by:
2. Active transport
Examples: When you add
a sugar cube to water
Partner #1: Explain the structure of a cell membrane and the term semi-permeable.
The cell membrane is made up of _____
Semi or selectively permeable means ___
Partner #2: Describe the term diffusion. Be sure to include the term “passive transport” in your answer.
Diffusion is ________
****Because water is moving from an area of higher concentration to an area of lower concentration, osmosis does not require cells to expend energy.
*****Therefore, osmosis is a type of passive transport!!!!!
We have talked about three types of passive transport. Take a minute to quietly look through your notes and refresh you memory on the three types of passive transport.
Circle the three types of passive transport in your notes!!!
With your table partner discuss the following:
Partner 1: Explain the term passive transport.
Passive transport is the movement of molecules from and area of ______
Partner 2: Explain diffusion. What types of substances diffuse through our cells.
Diffusion is the movement of ________ from an area of______
Partner 1. Explain osmosis. What substance is moved in our cells through osmosis?
Osmosis is the movement of ________ from an area of______
Partner 2. Explain facilitated diffusion. What substance is moved in our cells using facilitated diffusion.
Facilitated Diffusion is the movement of ________ from an area of______
a) Pinocytosis -involves the transport of solutes or fluids
b) Phagocytosis -involves the transport of large solid particles or whole cells.
Example: White blood cells engulfing bacteria.