chapter 3 section 2
What is basically a bundle of energy?
Atoms
Small number in the left hand corner of an element on the periodic table states...
How many protons and electrons are in that atom
Two or more atoms held together by a chemical bond
Molecule
Electrons are...
Negative energy
Transport proteins....
Pick up molecules outside the cell and carries them in.
Protons are...
Positive
There will always be the same number of
Protons as electrons
The bottom number on on element of the periodic table represents..
The average mass of the atom
The number of neutrons can...
Vary
in _____ transport energy is used.
active
cells are small because.....
all materials move into and out of cells through the cell membrane
equilibrium doesn't need an
arrow
oxygen moves from the lungs and into the blood stream.
diffusion
passive transport ______ require the cells own energy.
doesn't
in diffusion, molecules move from _____ concentration, to ______ concentration.
higher, lower
in diffusion, molecules move from an area of ______ concentration, to an area of ______ concentration.
higher, lower
in osmosis, molecules move from _____ concentration, to ______ concentration.
higher, lower
in passive transport molecules move from _______ concentration, to ______ concentration.
higher, lower
in active transport, molecules move from _______ concentration to ______ concentration.
lower, higher
what are the 6 steps to "drawing a picture"
membrane, nucleus, arrow, transport proteins (if using active transport), key, molecules
in _______, water molecules diffuse through a selectively permeable membrane.
osmosis
the diffusion of water molecules through a selectively permeable cell membrane
osmosis
water moves out of the cells of a saltwater fish and into the ocean.
osmosis
in _____ transport, energy is not used.
passive
diffusion and osmosis are both types of _______ _______.
passive transport
moving materials through the cell membrane without using energy is called __________ ________.
passive transport
means letting some but not all substances pass through.
selectively permeable
the cell membrane is ______ which means that some substances can pass through it while others cannot.
selectively permeable
remember,
the answer is in the question
true\false-- as a cell gets larger, it takes longer for a molecule that as entered the cell to reach the middle of the cell.
true
list two was the cell moves things by active transport.
*transportation proteins carry materials into and out of cell *cell membrane engulfs a particle -- engulfing
What two things make up the nucleus of atoms.
Protons, neutrons
What orbits around the nucleus of an atom?
Electrons
Neutrons are....
Neutral
sodium is pumped out of a nerve cell.
active transport
how does active transport differ from passive transport?
active transport requires the cell to use its own energy, whereas passive transport does not
the process by which molecules tend to move from an area of higher concentration to an area of lower concentration
diffusion
the two ways of moving things into and out of cells hat do not need energy are _____ and ______.
diffusion, osmosis
list three ways substances can move into and out of a cell
diffusion, osmosis, active transport