3. Organisms Exchange Substances with their Environment: Definitions (AQA A-Level Biology): Flashcards

Tiny air chambers in lungs; large surface area for gas exchange

Emulsify fats, increasing surface area for enzyme action

Pumps deoxygenated blood to lungs via pulmonary artery

Quaternary protein in red blood cells for oxygen transport

Increased $CO_2$ reduces $O_2$ affinity; releases $O_2$ in active tissues

Pores in leaves; open/close to regulate water loss & gas exchange

Plant tissue specialised for water transport

Transports organic compounds from production to use sites

Protein transporting 2 molecules in opposing directions

Muscle under lungs; contracts/relaxes to create pressure changes