Membranes

2. - Maintains a constant internal environment that is different from the external environment
4. - Type of junction that forms a tight seal between cells
5. - Type of transport that does not require energy input
8. - Movement of solute across a membrane against its gradient
10. - Term for the lateral movement of lipids and proteins within the membrane
11. - Type of protein covalently attached to a lipid in the membrane
13. - Process of plasma membrane invaginating to form a vesicle that brings substances into the cell
15. - Type of membrane protein physically embedded in the hydrophobic portion of the phospholipid bilayer
16. - Term for the movement of solvent molecules through a membrane

1. - Allows the direct movement of substances between adjacent animal cells
3. - Main structural component of the phospholipid bilayer
5. - Main structural component of the phospholipid bilayer
6. - Junction type that links cells to each other and to the extracellular matrix
7. - Factor affecting membrane fluidity by making them more fluid
9. - Process of material inside the cell being packaged into vesicles and excreted into the extracellular medium
12. - Process of moving solute against its gradient requiring energy input
14. - Selective uptake and export of ions and molecules