Science Test prep Flashcards
what are the 5 main things about living thing?
1 living things grow in size, reproduce, and are able to repair themselves
2 living things require energy
3 living things respond to changes in their enviorments
4 living things have a life spam
5 living things produce waste
What is celll theory?
All living thins are composed of one or more cells
what are the two types of plant cells?
the dark bean shaped cells are used for gas exchange
And the puzzel looking cells are called epithelial cells which can help with protection as a covering
What are nerve cells?
Nerve cells help animals to respond to the change in their enviormeant
Nerve cells help plants to communicate with one another by pass electricity to one another
What are smooth muscel cells?
These cells line the organs of the digestive systems and help move food through the digestive system
What are red blood cells?
Red blood cells carry oxygen through the blood.
Why are red blood cells the colour red?
These cells have a special molecule called hemoglobin which allows them to haveits red colour and enbales them to bind oxygen
What is the cell to the system
The cell is the basic unit of life all living systems are built on the cell
Where do all cells come from?
all cells come from preexsiting cells
What are the three main things about systems?
1 All systems have inputs and outputs
2 All work together to achieve a task
3 All have different parts in order to function
What is diffusion?
diffusion is when a liquid or gas moves to areas with high concentration , to
low consentration. They continue until both sides are even.
Explain osmosis.
Osmosis is when water molecules move to an area where the concentration of souloute is very low instead of an area where a soulte is high.
_it will try to balnce it out
thats why it goes from low to high so it contuies until both sides are the same
the process of when water is going into and out of the cell
How does osmosis make turgor pressure in plants?
By limiting expansion, the cell wall prevents the cell from bursting and causes plants to stiffen
Water rushes into the cell which puts an outward pressure on the cell wall from the inside.
What cell organelles makes tugor pressure in a plant cell possilble? Describe the role of this organelle in this process.
The primary role of the central vacuole in a plant cell is to maintain turgor pressure within the plant cell. Turgor pressure occurs when the fluid content of a cell pushes the cell membrane against the cell wall in order to provide shape to the plant cell.
What is the mitochondria?
Produces energy for the cell
