Biology Unit 2: Cell Transport

Tonicity

________: because many solutes can not move back and forth between the cell, water moves back and forth in an attempt to maintain homeostasis.

Active transport

________: low to high (requires energy)

Passive transport

________: high to low (doesnt require energy)

solute concentration

Hypertonic: ________ is greater outside.

Simple diffusion

________: through lipid bilayer.

Exocytosis

________: substance moved to outside the cell.

Isotonic

________: solute concentration is equal inside and out.

Hypotonic

________: solute concentration is greater inside.

Endocytosis

________: substance moved to inside the cell.

passive transport

high to low (doesnt require energy)

simple diffusion

through lipid bilayer

facilitated diffusion

through protein channels

tonicity

because many solutes cannot move back and forth between the cell, water moves back and forth in an attempt to maintain homeostasis

isotonic

solute concentration is equal inside and out

isotonic water movement

both ways (cell size stays the same)

hypertonic

solute concentration is greater outside

hypertonic water movement

out (cell shrinks)

hypotonic

solute concentration is greater inside

hypotonic water movement

in (cell grows)

active transport

low to high (requires energy)

endocytosis

substance moved to inside the cell

endocytosis examples

phagocytosis, pinocytosis, white blood cells

exocytosis

substance moved to outside the cell

exocytosis examples

waste, toxic molecules