Active Transport Flashcards
What is concentrated solution
Concentrated solution is a solution that contains a large amount of solute relative to the amount that could dissolve.
What is dilute solution
When small amount of solute is dissolved in a relatively large quantity of solvent, then the solution is called dilute solution.
What is crenation in animal cell
crenation shows the formation of surfaces on cells as a result of water loss through osmosis. Cells are usually in an isotonic solution inside the body, meaning that there is the same concentration of solute and water both inside and outside the cells.
What is lysis in animal cell
Animal cells lack rigid cell walls. When they are exposed to hypotonic environments, water rushes into the cell, and the cell swells. Eventually, if water is not removed from the cell, the pressure will exceed the tensile strength of the cell, and it will burst open, or lyse.
What happens when water enters the plant cell
When water enters the plant cell the plants grow and turn rigid or Turgid. Plants rely on osmosis to support their stem and leaves. The pressure that builds is called turgor. Turgor pressure is what makes it rigid.
What happens when water leaves the plant cell
When water leaves the cells no Longer become firm as they become flaccid (soft). The plant wilts as turgor no longer supports the plant tissues.
What is active transport
Particles move from an area of low concentration to an area of high concentration, across a partially permeable membrane
what is the relationship between SA:V and how well an organism can exchange materials?
The surface area to volume ratio of a cell must be such that the cell membrane has enough surface area to adequately serve the internal contents (volume) of the cell, including the adequate exchange of gases. As the cell grows, its surface area to volume ratio decreases, reducing the rate of gas exchange
How are alveoli adapted for exchange?
The alveoli are covered by a rich blood supply of capillaries- this provides a diffusion gradient for oxygen to move into the blood and carbon dioxide to move into the lungs.The alveoli are also highly folded, meaning there is a high surface area: volume ratio for gas exchange.
How are stomata adapted for exchange?
Leaves are adapted for photosynthesis and gaseous exchange. They are adapted for photosynthesis by having a large surface area, and contain openings, called stomata to allow carbon dioxide into the leaf and oxygen out.
What is active transport?
active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement.
How is active transport different to diffusion?
Passive Transport (or Diffusion) moves ions from high concentration to low, using no metabolic energy. Active Transport moves ions from low concentration to high, using metabolic energy in the form of ATP. … Both use ion channels to move ions across the cell membrane, in or out of the cell.
How do plants use active transport?
The plant cannot rely on diffusion as the nitrates would diffuse out of root cell into the soil. Hence the cells utilise energy to actively transport nitrates across the cell membrane into the root cell, against the concentration gradient.
