Cell Theory
Structure & Function of Cells
Cell Theory
• The cell theory
states that (1) all
living things are
made of cells; (2)
cells are the basic
units of structure
and function in
living things; and
(3) living cells
come only from
other living cells.
The Microscope
• The invention of
the microscope
made it possible
to discover cells.
• Robert Hooke
used to discover
cells.
Structures and Functions of Cells
• Cell wall
gives
protection
and support
to the plant
cells.
Structures and Functions of Cells
• The cell
membrane
regulates the
movement of
materials
into & out of
the cell.
Structures and Functions of Cells
• Nucleus is
the control
center of
the cell
Structures and Functions of Cells
• Mitochondria are the
“powerhouse” of the cell.
Structures and Functions of Cells
• Chloroplast
capture the
energy from
the sun and
uses it to make
food for the
plant cell.
Structures and Functions of Cells
• Vacuoles store food, water, and waste.
Structures and Functions of Cells
Endoplasmic
Reticulum
Rough ER
makes proteins
Smooth ER
makes lipids
Structures and Functions of Cells
The Golgi
Apparatus
• The packaging center of the cell
• Prepares lipids and proteins for shipment across
the membrane
Structures and Functions of Cells
• Lysosomes digest excess or worn-out organelles, food
particles, and engulf viruses or bacteria.
• The Waste Management Center of the Cell
Heart Cells Pumping
Cell Processes
• The sum of all the activities that occur
in a living cell is called metabolism.
Cell Processes
• In aerobic respiration, energy is released
from food with the help of oxygen.
Cell Processes
• Food, oxygen, water and other materials
enter and leave the cell by a process called
diffusion.
Cell Processes
• Water
passes
through
the cell
membrane
by a type
of
diffusion
called
Cell Processes
• Mitosis is the division of the nucleus and
the cytoplasm and the duplication of the
chromosomes.
T-Rex Blood Cells