KINE 2011 Lecture Notes - Lecture 3: Active Transport, Organelle, Electric Potential

• School: York University
• Department: Kinesiology & Health Science
• Course: KINE 2011
• Professor: Ali Abdul Sater

Document Summary

Active tra(cid:374)sport i(cid:374) cell me(cid:373)bra(cid:374)e: cellular processes require molecules to be contained @ high concentrations, high concentrations achieved by energy dependant transport that moves molecules against, passive is w/concentration gradient; active is against gradient. Active transport requires energy: expenditure of energy in forms of atp- about 25% of cells energy, ex: concentrated sugar & amino acids inside cell & pushes out ions. 3 main functions of active transport: uptake of essential nutrients from fluid surrounding cell, removal of waste material from cell/ organelle, maintenance of essential constant intracellular fluid concentration of: h+, Na+, k+ & ca: electric potential important in neurons & muscle cells. 2 classes of active transport: primary & secondary. Primary: same protein that transports molecules also hydrolyzes atp to power. Secondary: transport indirectly driven by atp, transports proteins using favorable concentration gradient of ions built by primary at as energy to drive transport of different molecules.