Chapter 7b

regard to this animation

Both sodium and potassium ions are transported against their concentration gradients.

the driving forces for diffusion of Na+ and K+ ions through their respective channels?

The diffusion of Na+ ions into the cell is facilitated by the Na+ concentration gradient across the plasma membrane, he diffusion of K+ ions out of the cell is impeded by the electrical gradient across the plasma membrane, The electrochemical gradient is larger for Na+ than for K+.

Glucose moves _______ its concentration gradient

against

Na+ moves _____ its electrochemical gradient.

down

endocytosis

forms vesicles from inward folding of the plasma membrane, decreases the surface area of the plasma membrane

Na+ low

glucose high

Na+ high

glucose low

exocytosis

increases the surface area of the plasma membrane, requires fusion of vesicles with the plasma membrane, secretes large molecules out of the cell

Endocytosis moves materials _____ a cell via _____.

into, membranous vesicles

A white blood cell engulfing a bacterium is an example of

phagocytosis

exocytosis and endocytosis

requires cellular energy, transported substances never physically cross the plasma membrane Submit

You can recognize the process of pinocytosis when

the cell is engulfing extracellular fluid