active transport

Question 1

definition of active transport

Answer 1

Active transport is the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration using energy from respiration

Question 2

how is the energy needed for active transport provided and from where

Answer 2

The energy needed to do this is provided by respiration. Aerobic respiration, in mitochondria in the cell, releases energy for the cell to use.

Question 3

why is active transport important

Answer 3

• “If diffusion was the only way a cell could take in substances, it would have no control over what went in or out. ”
• Active transport is very much important for the survival of a cell because it allows the cell to move substances against the concentration gradient. It allows the cell to maintain the appropriate balance of substances.
• It is crucial for cell survival and rapid nutrient absorption by the cells.

Question 4

what is Protein carriers

Answer 4

Protein carriers in cell membranes change shape to move substances across the cell membrane during active transport.

Question 5

Give examples of cells that carry active transport

Answer 5

• -In human’s small intestine, glucose can be actively transported from lumen of intestine into cells of villi
• -Root hair cells take nitrate ions from the soil via root hair cells