Transport in Cells Flashcards
What’s diffusion?
The spreading out of the particles of any substance in solution, or particles of a gas, resulting in a net movement from an area of higher concentration to an area of lower concentration
Via diffusion substances may…
move into and out of cells across the cell membranes.
A single-celled organism has a relatively large surface area to volume ratio which allows…
sufficient transport of molecules into and out of the cell to meet the needs of the organism.
What’s osmosis?
It’s the diffusion of water from a dilute solution to a concentrated solution through a partially permeable membrane.
What’s active transport?
It moves substances from a more dilute solution to a more concentrated solution (against a concentration gradient) which requires energy from respiration.
What does active transport mean for mineral ions?
It allows them to be absorbed into plant root hairs from very dilute solutions in the soil. Plants require ions for a healthy growth.
What does active transport mean for sugar molecules?
It allows them to be absorbed from lower concentrations in the gut into the blood which has a higher sugar concentration. Sugar molecules are used for cell respiration.
