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Homeostasis and Transport

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Keystone Biology

on 12 October 2016

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Transcript of Homeostasis and Transport

Homeostasis and Cell Transport
Active Transport
Facilitated Transport
Diffusion is the distribution of particles from an area of higher concentration to an area of lower concentration without using energy.
The movement of water across a semipermeable membrane from an area of high concentration to an area of low concentration without using energy.
A hypertonic solution is a solution that contains a lower concentration of water than inside a cell, so water leaves the cell to balance the difference and causes the cell to shrivel.
A hypotonic solution contains a higher concentration of water outside the cell, causing the water to pass through the membrane into the cell. This causes the cell to swell.
Isotonic solutions have balanced concentration within the cell, so there is a constant and equal flow of water in and out of the cell.
Movement of particles from an area of low concentration to high concentration.

Facilitated transport is a form of passive transport that uses transport proteins in the phospholipid bilayer (cell membrane) to allow particles into the cell that may be too big to pass through the semipermeable membrane that the cell needs.
Explanation of Osmosis^
Osmosis in blood cells:
High concentration of water outside of the cell
High concentration of water inside the cell
Endocytosis is a form of active transport where a cell wraps the membrane around a particle to take it in as food or for other uses.
Exocytosis is when a cell uses energy to expel substances from inside the cell into the environment surrounding the cell.
Uh oh... I feel a yawn coming on.
Aaaand it's gone.
Note: This has nothing to do with osmosis, and neither does the movie Osmosis Jones. Oh well, a little random is good for you. Just like equilibrium and homeostasis, right?
Wait... You were still here?
You saw all that?
For real though:
Diffusion is the distribution of particles from an area of higher concentration to an area of lower concentration.
Take quiz in BrainHoney:
Maintenance of a constant internal state.
Cell (plasma) Membrane
- Surrounds the cytoplasm of the cell
- Controls traffic going into/out of the cell
- Semipermeable
- Made of phospholipids, proteins and carbohydrate chains.
Passive Transport
A process that DOES NOT require energy
to move molecules from a HIGH to LOW concentration.
- Diffusion
- Facilitated Diffusion
- Osmosis
- uses ATP as an energy source
- used to build up a concentration gradient
- ION and molecular pumps
-thermoregulation: temperature regulation
- osmoregulation: water regulation
- gas exchange
- blood glucose
sends a signal to the

that the normal levels have changed. The coordinating center then messages the
which helps restore normal balance.

Homeostasis Video
Click on this link and go through all 4 scenes:
Full transcript