active transport Flashcards
active transport
the carrying of dissolved molecules across a cell membrane from a lower to higher concentration, using energy from respiration
why does active transport require energy?
active transport goes against the concentration gradient
what do cells that carry out active transport specifically contain and why?
mitochondria as it releases energy from aerobic respiration
give two examples of active transport?
- glucose in the small intestine
- ions and root hair cells
why can’t root hair cells use diffusion?
the concentration of mineral ions is usually higher in the root hair cells than in the soil around them
when is active transport used in the gut?
when there is a lower concentration of nutrients in the gut, but a higher concentration of nutrients in the blood
what does active transport allow?
active transport allows nutrients to be taken into the blood even through the concentration gradient is the wrong way
what energy does active transport use?
energy from respiration
