Unit 2 Concept 2

Question 1

Homeostasis

Answer 1

Need of an organism to stay stable by regulating internal conditions

Question 2

A dynamic equilibrium is maintained= ?

Answer 2

It isn’t always the same, but things stay within a range

Question 3

Organisims constantly take in what? and have to respond to what?

Answer 3

Constantly take in Stimuli

And have to respond to stimuli in order to maintain homeostasis

Question 4

Stimulus= a change in what?

Answer 4

A change in environment

Question 5

Response=a change in what

Answer 5

A change in the organism as a result of a stimulus feedback mechanisms evolve to help maintain homeostasis in organisms as they respond to stimuli

Question 6

In Positive feedback loop, the output of a system does what to the response

Answer 6

It intesfies the response
Ex: Human child birth

Question 7

In Negative feedback loop the output of a system cause a counter response return to what?

Answer 7

to a set point
Ex: Human body temperature

Question 8

Cell membrane

Answer 8

Controlling movement of things in and out of the cell

Question 9

Peremable

Answer 9

Allowing things to go through.

Question 10

The cell membrane is picky about what?

Answer 10

What goes in and outside the cell

Question 11

What things can pass easily through the cell membrane

Answer 11

Small

non polar

hydrophobic

and/or neutral as well as water

Question 12

What things CANNOT pass. easily through the cell membrane

Answer 12

Polar

and/or large molecules

Question 13

Passive

Answer 13

Passive transport requires no energy by the cells because molecules move from high concentration to low concentration areas down the concentration gradient.

Question 14

Active

Answer 14

Active transport requires energy to be spent to bring materials into the cell or expel materials out of the cell moving from low to high concentration against the concentration gradient

Question 15

Solute

Answer 15

what gets dissolved

Question 16

Solvent

Answer 16

does the dissolving

Question 17

Solution

Answer 17

uniform mixture of two or more substances

Question 18

Concentration

Answer 18

Amount of solute dissolved in solvent

Question 19

Concentration Gradient

Answer 19

difference in concentration of a substance from one location to another

Question 20

Simple diffusion

Answer 20

The spreading out of molecules across a membrane until equilibrium is reached

Question 21

Equilibruim=

Answer 21

equally concentrated gradient from high to an area of low

Question 22

Molecules move how?

Answer 22

They move down a concentration gradient from high concentration to an area of low concentration

Question 23

Faciliated Diffusion

Answer 23

A transport protein help to facilitate the diffusion of molecules that normally couldn’t pass through the cell membrane

Question 24

Transport proteins can act as what?

Answer 24

They can act as a channel or a carrier

Question 25

Molecules move how?

Answer 25

Down a concentration gradient from high concentration to an area of low concentration

Question 26

Osmosis

Answer 26

The simple diffusion of water across the cell membrane

Question 27

Water molecules move how?

Answer 27

down a concentration gradient from water concentration to low water concentration until equilibrium is reached

Question 28

High water concentration means

Answer 28

low solute concentration

Question 29

Low water concentration means

Answer 29

high solute concentration

Question 30

Hypertonic solutions

Answer 30

Water concentration is lower than cells cytoplasm Net movement of water OUT of cell then cell shrives

Question 31

Hypotonic solutions

Answer 31

water concentration is higher than cells cytoplasm net movement of water in a cell causes cell to swell

Question 32

Isotonic solutions

Answer 32

equal water concentration to cells cytoplasm cell stays the same

Question 33

Molecular pumps

Answer 33

When a cell uses energy to pump molecules across the membrane against the concentration gradient, through a protein channel

Question 34

This allows a cell to concentrate key molecules within the cell.....

Answer 34

or remove waste quietly from the cell

Question 35

Endocytosis

Answer 35

uses vesicles to move into the cell

Question 36

Phagocytosis

Answer 36

cell eating

Question 37

Cell engulfs

Answer 37

solids into vesicles and digest them

Question 38

Pinocytosis

Answer 38

cell drinking

Question 39

Exocytosis

Answer 39

Uses vesicles to export materials out of the cell