Transcript Animal and Plant Gas Exchange

Animal and Plant Gas Exchange
How animals and plants get the gases they need
 ANIMAL SYSTEMS
There’s two types of respiration that animals do.
One is breathing, the other is cellular.
Plants do the cellular one, but not the breathing one.
What’s the diff??
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Internal Respiration
AKA cellular respiration!
Mitochondria
O2 is converted into CO2
Glucose is converted into ATP
This happens in the cells!
What’s the diff??
 External Respiration
 Breathing in and out
 O2 is sucked in by the nose
and mouth
 O2 travels to lungs where
the blood trades it for CO2
 CO2 is breathed out as a
waste from Cellular
Respiration!
Structures of Respiratory System
 Nose and Mouth
 Breathe in and out
 Trachea
 Air flow travels through
this tube
 Lungs
 Alveoli (air sacs) are the
sight of gas exchange
Breathing
So what’s the point?
 Function:
 To breathe in O2 (for
cellular respiration)
 To exchange O2 for CO2
 To get rid of (breathe
out) CO2
 SO…. We do external
respiration (breathing) to
have reactant gas (O2) for
internal respiration
(cellular respiration) and
to get rid of the waste
product (CO2)
How does gas exchange work in
Respiratory System?
 Tiny blood vessels called
capillaries bring blood
around the alveoli sacs to
exchange gases
What do we need to breathe for?
 OXYGEN intake!
 CARBON DIOXIDE
removal!
 We have to breathe so
that we can do cellular
respiration!!!!
 What happens to the CO2
we get rid of???
 THINK…PLANTS duh!
RECAP
Questions
 What is the difference
between the respirations?
 Why do we need to have
Oxygen?
 What happens to the CO2
we breathe out?
 What structures actually
do the gas exchange?
 AND THE BIG
QUESTION…
 Do you think plants have
a way to do gas
exchange?
 Do you think it works the
same way??
Plant System Gas Exchange
 PLANTS DON’T
BREATHE!!!!
 They do cellular
respiration, but not the
lung one!
 They need to have a way
to get CO2 and get rid of
O2
 The Answer??
 A LEAF!!
What’s in a Leaf?
 Leaf cross section
What’s in a Leaf?
 Instead of a mouth for
breathing, leaves have
stomata
 Pores in the underside of
the leaf for gas to flow in
and out
 Also for water to leave!
Stomata
 Also called stoma
 Holes in the leaf
 Guarded by cells that
control how wide the
pore is (Guard Cells)
 Important for gas
movement
 AND WATER loss!
Transpiration
 Plant sweating
 On wet days, the cells are
swollen with water and
they bend, opening the
stomata pore
 On dry days, they are thin
and straight, closing off
the stomata pore
But why would it ever close?
 Plants lose too much
water if they stay open
 But they don’t get
enough CO2 in if they’re
closed….hmmm
 So when would be a good
time for them to be
closed?
How does gas travel in a plant?
 Travels through the spongy mesophyll to get to the
palisade mesophyll (where photosynthesis occurs)
So what’s the point?
 Why do plants need
CO2?
 Why do they need to
get rid of O2?
 What happens to the
O2?
 What else is ‘leafing’
out of the plant
besides O2?
Gas Travel
 So the respiratory system in animals is for gas
exchange….
 How does this compare to the plant system?
 What do these both need gas for?
A COMPARISON
 Explain how the
respiratory system in
animals is comparable to
the gas exchange system
in plants.
 Make sure you look at
structures, functions,
importance.
 Work as a group.