BMS02-1008 - Movement of Ions and Molecules in the body

Questão	Responda
What is the approximate ionic concentration inside living cells vs. Extracellular fluid for Na+, K+, Ca2+, and Cl-?	Intracellular/Extracellular Na+: 10/140 K+140/4 Cl-: 4/140 Ca2+: 10^-3, 2.5
How do the following mass through the cell membrane: 1. Gases 2. Nonpolar/small uncharged polar 3. Ions 4. Larger molecules (eg. glucose)	1. Passive diffusion 2. Passive diffusion 3. Via channels/pumps 4. Channels/pumps
What are 3 features of the cell membrane?	1. Selective barrier (nutrients in, waste out) 2. Phospholipid bilayer 3. Fluid and self-sealing for endo/exocytosis
Water soluble is hydro... Water insoluble is hydro...	Hydrophilic, polar Hydrophobic, non polar
Simple diffusion (passive down a gradient) can occur through which two ways?	1. Direct through membrane 2. Through channels
What are the two types of active transport? (moves against gradient)	1. Antiport (eg. 3Na+ out /2K+ in ATPase 2. Symport (with a molecule moving passive down its gradient) (eg. Na+ with sugar/amino acids)
How is the osmotic gradient maintained by cells?	Na+/K+ pump maintains a much higher extracellular [Na+] compared to intracelluar. The membrane is relatively impermeable to Na+. As a result, if an increase in intracellular concentration arises (due to proteins etc. entering), the Na+ outside allows the osmotic pressure inside and outside to equal, so fluid doesn't move into the cell and cause it to burst.

Resumo de Recurso

	Criado por Evian Chai mais de 4 anos atrás