Chapter 3: Cells Flashcards Preview

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Flashcards in Chapter 3: Cells Deck (25):
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Cell

Simplest units of all living matter

1

Plasma membrane

Surrounds the cell

Selectively permeable

Regulates movement of materials entering and exiting the cell

2

Nucleus

Cells control center

Contains the DNA

Give cell instructions how to work

3

Cytoplasm

Gel like substance that fills space between the plasma membrane and the nucleus

Contains cell organelles

4

Endoplasmic reticulum

Network of canals


No ribosomes = smooth

ribosomes = rough

5

Ribosomes

Site of protein synthesis

6

Golgi apparatus

Receives proteins and prepares and packages them for transport

7

Centrosomes

Plays a role in cell division

8

Lysozymes

Contains enzymes that help to break down proteins that the cell does not need

9

Mitochondria

Power houses

Convert organic compounds into ATP which the cell uses for energy

10

Cytoskeleton

Supporting framework of the cell

11

Cilia

Extensions on the surface of the cell

12

Flagella

Hair like projections that help the cell to move

13

Passive transport

Includes diffusion, osmosis, filtration and facilitated diffusion

Does NOT require energy

14

Diffusion

Movement of particles from an area of high concentration to an area of low concentration

15

Osmosis

Movement of WATER down the concentration gradient through a selectively permeable membrane

16

Concentration gradient

Difference in concentration of a substance from one point to another

17

Tonicity

The ability of a solution to affect the fluid volume and pressure of a cell through osmosis

18

Hypertonic

Solution that contains a higher concentration of solutes compared to the fluid within the cell

19

Hypotonic

Solution that contains a lower concentration of solutes compared to the fluid with in the cell

20

Saline

Hypotonic? Hypertonic? Or Isotonic?

Is considered an isotonic intravenous solution

21

Isotonic

Solution in which the concentration of solutes in the solution is the same as the concentration of solutes in the cell

22

Filtration

Water and dissolved substances are forced across the membrane from an area of high hydrostatic pressure to an area of low hydrostatic pressure

23

Facilitated diffusion

Requires a channel or a pore to allow molecules to diffuse from an area of high to low concentration

24

Active transport

Solutes move against the concentration gradient from areas of low concentration to areas of high concentration

Requires energy in the form of ATP