Ch. 8.3-4 Vocabulary

Question 1

homeostasis

Answer 1

relatively constant internal physical and chemical conditions that organisms maintain

Question 2

diffusion

Answer 2

process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated

Question 3

facilitated diffusion

Answer 3

process of diffusion in which molecules pass across the membrane through cell membrane channels

Question 4

osmosis

Answer 4

diffusion of water through a selectively permeable membrane

Question 5

isotonic

Answer 5

when the concentration of two solutions is the same

Question 6

hypertonic

Answer 6

when comparing two solutions, the solution with the greater concentration of solutes

Question 7

hypotonic

Answer 7

when comparing two solutions, the solution with the lesser concentration of solutes

Question 8

osmotic pressure

Answer 8

pressure that must be applied to prevent osmotic movement across a selectively permeable membrane

Question 9

tissue

Answer 9

group of similar cells that perform a particular function

Question 10

organ

Answer 10

group of tissues that work together to perform closely related functions

Question 11

organ system

Answer 11

groups of organs that work together to perform a specific function

Question 12

receptor

Answer 12

on or in a cell, a specific protein to whose shape fits a specific molecular messenger, such as a hormone