Physiology 2130 Lecture Notes - Lecture 2: Autocrine Signalling, Homeostasis, Cytokine

• School: Western University
• Department: Physiology
• Course: Physiology 2130
• Professor: Anita Woods

Document Summary

Function: o oxygen transport (hemoglobin) o cellular communication (hormones) o body protection (antibodies) o dna replication and repair o metabolism (enzyme: 4 functions of membrane proteins. Simple diffusion (no atp) o movement of molecules high [ ]+ low[ ]+ due to molecules random thermal motion o passive process (no energy provided) ** o once the chemical equilibrium (concentration are equal) has been reached, the diffusion stops, but the molecules continue to move o the molecules diffuse down their concentration gradient** o 6 factors that affect the rate of diffusion: Facilitated diffusion (large molecule with carrier protein channel) (no atp) o passive transport o transporter protein facilitates the movement of an otherwise membrane impermeable molecule or ion across the plasma o factors that affect the. C. active transport (need atp) o moves molecules against the concentration gradient [ l ]+ [ h ]+ o need atp o chemical specificity o competitively inhibited o carrier mediated transport o limited transport capacity.