Cells

2.  Smallest known unit of functioning life
 All known living things are composed of at
least 1 cell
 Are the most basic form of life that can
survive

3.  A man named Antony van Leeuwenhoek
created the first microscope.

5.  Light compound microscope
 Electron microscope

18.  Multicellular-
 Are made up of more than one cell
 Unicellular-
 Are made up of only one cell

23.  Cancer-

24.  HIV-

26.  Cells rarely work alone:
 Cellsthat have similar structure or function
are organized into TISSUE

29.  Tissues
that work together for a common
purpose form ORGANS
 ORGAN SYSTEM is a group of organs
that work together for a common purpose

32.  Ameobas move using foot-like projections
called PSEUDOPODS
 These
stretch and compress to move the
ameoba
Some use CILIA – Hail-like structures that
wiggle

34.  Process is called DIFFUSION
 Right
now your cells are bring in water,
gases and other substances
 The bringing in and removal of substances
is critical for survival

35.  Particles move from an area of
• HIGH CONCENTRATION -------> LOW
CONCENTRATION
• Will diffuse until particles are balanced out

37.  Thecell membrane on an animal cell acts
as a filter with extremely tiny openings
 The holes are small enough to keep all the
cells “guts” inside
 Butbig enough for other particles to get
through

39.  This
all happens because of the CELL
MEMBRANE!!

40.  The
cell membrane is believed to be
SELECTIVELY PERMIABLE
 This means that only certain things are let
in
 Think of it as a party and only people with
invitations can come inside.

41.  Water particles are small enough to pass
in and out through the cells membrane
 Water diffusion is vital to the health and
survival of the cell
 Water particles go from
• HIGH CONCENTRATION  LOW CONCENTRATION

42. 3 things cal happen to cells through the
process of osmosis
• 1) Balance of water on inside and outside
• 2) To much water inside cell than outside cell
• 3) To much water outside the cell vs inside the cell