transport of the cell membrane

When the concentration of a solute is the same throughout a system, the system has reached

equilibrium

___ charged ions are traveling through a cell membrane with the concentration gradient

f

Endocytosis

fuses substances with the cell membrane will form vesicles to be taken inside the cell

Give a scenario where a cell may need to perform a form of endocytosis

When a large molecules like polysaccharides (large carbohydrates) approaches the cell they need to FUSE those molecules in order to bring it inside the cell.

_____ cells lining the gut need to take in glucose, but at a certain time, the concentration of extracellular glucose is lower than the concentration already stored in the cells.

a

what does both simple diffusion and facilitated diffusion do but what also makes them different?

both move with the concentration gradient, but only the simple diffusion doesn't require transport proteins while the facilitated diffusion does

____ at a certain time, glucose is in a high concentration outside of a cell and needs to travel through the membrane into the cell.

f

are endocytosis and exocytosis forms of passive or active transport?

form of ACTIVE transport

simple diffusion

form of passive transport requiring no energy, moves with the flow, moves with concentration gradient, molecules move from a high concentration to low concentration, when water molecules can move easily through the cell membrane with energy because they are so small, contains no transport proteins channels

Osomis

movement of water across a semipermeable membrane

Pinocytosis

(endocytosis) process by which a cell takes in liquid from the surrounding environment, tiny pockets form along the cell ment with liquid and pinch off to form vacuoles

cell membrane

A cell structure that controls which substances can enter or leave the cell, maintain/regulate homeostasis

circle the statements below that are true about simple diffusion: A) a form of passive transport B) Molecules travel with the concentration gradient C) It is how glucose travels across the cell membrane D)it how OXYGEN and CARBON DIOXIDE travels across the membrane E) Transport is typical for large molecules

A, B, and D

give a scenario where a cell may need to perform a form of exocytosis

when molecules want to exit out of the cell, the reverse direction of endocytosis, used to get rid of cell waste BUT also getting valuable materials ou that the cell has made. EX: plants need carbohydrates to build plant cells so they use exocytosis to help take out the carbs out of the cell to help build the wall

is it simple diffusion, facilitated diffusion, or active transport: ____ for water to travel across the cell membrane at a substantial rate, the water molecules travel through protein channels known as AQUAPORINS

F

Diffusion

Movement of molecules from an area of higher concentration to an area of lower concentration.

facilitated diffusion

Movement of specific molecules across cell membranes through protein channels, still moves with the flow and the concentration gradient like the simple diffusion with any energy like passive transport but contains protein channels that facilitating/helping things pass through, quick easy they require charge particles like ions H+ and Na+

passive transport 2 (class notes)

Requires NO energy (ATP), Movement of molecules from high to low concentration, Moves with the concentration gradient,uses protein channels to move bigger molecules by using a facilitated diffusion

how do protein channels help?

They help transport large molecules like glycogen/glucose known as the facilitated diffusion

endocytosis

process by which a cell takes material into the cell by infolding of the cell membrane

active transport

requires ATP energy for the movement of molecules across the cell membrane, can change the cell, helps membrane bring in large particles (3 phosphates when bond is broken releases a great amount of energy)

active transport 2 (class notes)

requires energy ATP (made from the mitochondria through cellular respiration) can change the shape of the cell membrane to bring in large particles which is the form of endocytosis where it ends up creating a vacuole, against the concentration gradient meaning that moves from LOW to HIGH centration which why it needs energy uses protein channels to "pump" it brings ions (charged particles) like electrolytes CI-, K+, NA+, F-

_____while water molecules are polar, they are also very small, one fact not mentioned in the video is that some water molecules are able to squeeze directly through the phospholipid bilayer due to their small size

s

Exocytosis

the membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell, active transport, removal of water by the contractile vacuole, active transport, release large amount of material out the cell