Lesson 7.3-4 Flashcards
Passive Transport
The movement of materials
across the cell membrane
without using cellular
energy
Diffusion
The process by which molecules of a
substance move from areas of high
concentration of that substance to areas of
lower concentration
Facilitated DIffusion
Facilitated Diffusion-Molecules that cannot
directly diffuse across the membrane pass
through special protein channels
Osmosis
The diffusion of water through a
selectively permeable membrane from
an area of higher concentration to an
area of lower concentration.
Aquaporin
Water channel proteins that allow water
to flow through the membrane.
Isotonic Solution
The concentration of
solute molecules is the same inside and
outside the cell.
Hypertonic Solution
The solution has a
higher solute concentration than solute
concentration inside the cell.
Hypotonic Solution
The solution has a
lower solute concentration than the cell.
Active Transport
The movement of
molecules against a concentration difference
from an area of low concentration to an area
of high concentration. REQUIRES
ENERGY!
Endocytosis
A vesicle forms that large
molecules, clumps of food or
complete cells can be surrounded
by and then forms a vacuole to pull
the item into the cell.
Exocytosis
The forcing out of substances from
the cell membrane using vacuoles
and vesicles.
Phagocytosis
Large solids are taken into the
cell.
Pinocytosis
Large liquids are taken in the cell.
Homeostasis
An organism must maintain a
relatively constant internal physical
and chemical condition.
Tissue
Group of similar cells that perform a similar
function
Organ
Group of tissues that work together.
Organ System
Group of organs that work to complete
the system.
Receptor
To respond a cell must have a receptor
What happens to a cell when it is placed into an isotonic solution?
An equal amount of water enters and exits the cells
When a cell is placed in a hypotonic solution water will ___________ and the cell will ___________________.
flow into the cell, lyse
When a cell is placed in a hypertonic solution water will ___________ and the cell will ___________________.
flow out of the cell, shrivel
What has to be true in order for diffusion to occur?
There must be areas of different concentrations
What term do you use to describe no change in solution concentration level in the cell or solution?
Isototic
List the levels of organization from largest to smallest and smallest to largest.
Cell
Tissue
Organ
Organ system
