Unit 2 Concept 2 - Cell Transport

Question 1

homeostasis

Answer 1

need of an organism to stay stable by regulating internal conditions

Question 2

dynamic equilibrium

Answer 2

it isn’t always the same, but it stays within the range

Question 3

stimalus

Answer 3

change in environment

Question 4

response

Answer 4

change in the organism

Question 5

feedback mechanism

Answer 5

evolved to help maintain homeostasis in organisms as they respond to stimuli

Question 6

positive feedback loop

Answer 6

output of a system that intensifies the response

Question 7

negative feedback loop

Answer 7

causes a counter response to return to a set point

Question 8

cell membrane

Answer 8

homeostasis is maintained through regulation at the organ level-cellular level

Question 9

what is the cell membrane have to stop large substances from entering?

Answer 9

selectively permeable membrane

Question 10

2 types of cell transport

Answer 10

passive and active

Question 11

passive transport

Answer 11

requires no extra energy

Question 12

active transport

Answer 12

requires extra energy

Question 13

simple diffusion

Answer 13

(passive) spreading out of molecules across a membrane until equilibrium is reached, move down a concentration gradient

Question 14

facilitated diffusion

Answer 14

(passive) transports proteins and helps to facilitate the diffusion of molecules that normally couldn’t pass through the cell membrane

Question 15

osmosis

Answer 15

(passive) simple diffusion of water across cell membrane, move down a concentration gradient

Question 16

hypertonic solutions

Answer 16

water is lower than the cells cytoplasm, SHRIVELS

Question 17

hypotonic solutions

Answer 17

water is high than the cells cytoplasm, SWELLS

Question 18

isotonic solutions

Answer 18

identical water to the cell’s cytoplasm, cell stays the SAME

Question 19

molecular pumps

Answer 19

(active) cell uses energy to pump molecules across the membrane, against the concentration gradient

Question 20

Endocytosis

Answer 20

(active) uses vesicles to move large particles into the cell

Question 21

Exocytosis

Answer 21

(active) uses vesicles to export materials out of the cell

Question 22

Phagocytosis

Answer 22

cell eating

Question 23

Pinocytosis

Answer 23

cell drinking