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Flashcards in Ch4 Biology Vocab Deck (32):
1

things that can cause disruptions in homeostasis

stressors

2

movements of molecules across a membrane without the use of energy

passive transport

(molecules move "down" a concentration gradient)

3

cell part that can kill bacteria and viruses

lysosome

4

a membrane's ability to allow some molecules to cross while blocking others

selectively permeable

(selective permeability)

5

a solution in which the concentration of solutes outside the cell is LESS than the concentrations of solutes inside the cell

hypotonic solution

(hypo = under, less)

6

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

diffusion

7

group of organs that work together to perform a common function

organ system

(all organ systems are invovled in exchanging materials between different parts of the body)

8

observations that involve descriptions;

observations that are relative; subjective

qualitative observations

9

compartment within cells that perform specific functions

organelle

10

choosing ones behavior in order to minimize a stressful external situation

behavioral response example: seeking shelter from extreme heat or cold

11

all factors that might affect the outcome of an experiment

variables

(good controlled experiments only test ONE variable at a time)

12

observations that can be measured

quantitative observations

(think quantity)

13

a solution in which the concentration of solutes outside the cell EQUALS the concentration of solutes inside the cell

isotonic solution

(iso = equal)

14

a solution in which the concentration of solutes outside of the cell is GREATER than the concentration of solutes inside the cell

hypertonic solution

(hyper = over, more)

15

uniform mixture of 2 or more substances

solution

(solute: gets dissolved)

(solvent: does the dissolving)

16

blood vessels that carry blood AWAY from the heart

arteries

17

organ system that:

1) delivers air to the lungs

2) moves oxygen from lungs into the blood

3) moves carbon dioxide from the blood into the lungs

gas exchange system

(respiratory system)

18

organisms' internal systems maintain a dynamic equilibrium

homeostasis

(processes that keep internal systems in balance when external conditions keep changing)

19

organ system that:

1) transports oxygen, nutrients, and other substances to cells

2) carries waste products from cells

circulatory system

20

the smallest of blood vessels, where there is a direct exchange of materials between the blood and other body tissues

capillaries

21

forms the boundary between the inside of the cell and the outside environment

cell membrane

22

an outer rigid boundary of plant cells

cell wall

(also found in some fungi, bacteria, and protist cells)

(NOT in animal cells)

23

protein molecues on the surface of the cell membrane that bind to specific molecules

receptors

(usually when a specific molecule binds to a receptor on the outside, it triggers a response on the inside)

24

the name referring to the structure of a cell membrane

"lipid bilayer"

(lipid, or fat molecules, are arranged in two layers)

25

when proteins form channels that allow substances to move down their concentration gradient either into or out of the cell

facilitated diffusion

26

the "normal" condition or specimen in an experiment that has not been altered

control

(this is what you compare your experimental results to)

27

when two different concentrations are separated by a barrier

concentration gradient

(usually there is a concentration gradient on opposite sides of a cell membrane)

28

the movement of water molecules through a membrane from where they are more concentrated to where they are less concentrated

osmosis

(this is the "diffusion" of water molecules)

29

organ system that filters the blood to eliminate wastes

urinary system

30

movement of molecules across a cell membrane using cell energy

active transport

(movement of molecules "against" or "up" a concentration gradient)

31

cell part that contains the DNA (genetic material)

nucleus

32

blood vessels that carry blood TOWARD the heart

veins