Lecture 12 - Lecture 12 Transport Into and Through Cells o...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 12 Transport Into and Through Cells o Nutrients must cross the plasma membrane in order to enter the cell. o Water soluble ( hydrophilic ) nutrients cannot cross the hydrophobic core of the lipid bilayer and need help from transporters. o Fat soluble ( hydrophobic ) nutrients can cross the hydrophobic core of the lipid bilayer and do not rely on plasma membrane transporters. Examples: Water Soluble Nutrients Fat Soluble Nutrients Amino Acids Fatty Acids Sugars Cholesterol Water soluble vitamins Fat soluble vitamins Minerals o Transporters for hydrophilic nutrients are normally protein that traverse the lipid bilayer of the plasma membrane and help carry the nutrient into the cell. o They serve as nutrient specific holes in the plasma membrane.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
There are 3 mechanisms by which nutrients enter the cell. 1. Passive diffusion ( hydrophobic nutrients) a. requires a concentration gradient b. does not use a transporter c. does not need energy (ATP) 2. Facilitated diffusion ( hydrophilic
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

Lecture 12 - Lecture 12 Transport Into and Through Cells o...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online