ap biology discussion notes wednesday 11/04. goals for the day 1.be able to understand...
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AP Biology Discussion Notes
Wednesday 11/04
Goals for the Day
1. Be able to understand OSMOregulation based on what you know about osmosis & diffusion.
2. Be prepared for our Lab quiz tomorrow
11/04 Question of the Day• What 2 things are the main regulators of
whether something can move across the cell membrane?
Part 1
• Water –
• Iodine –
• Starch –
• Glucose -
Part 1 • Water & starch outside
• Iodine & Glucose -inside
??
Quiz Thursday• Lab Questions & CALCULATIONS• Know how to calculate (and graph)
– % change
• Water Potential Questions & CALCULATIONS!!
Work order for today• Video Notes on Osmoregulation
– Added later to 2nd Notebook (just like cell parts)
• 2nd Notebook for Diffusion/Osmosis Lab• Read pages 184-192 (just finish paragraph
at the top of the page) in the text book and take notes.
• A couple invitations…– Today after school bring your questions and
work on lab or other materials (quiz Thursday!)
11/04 Species of the Day
Atlantic Bluefin Tuna -Thunnus thynnus
11/04 Species of the Day
Atlantic Bluefin Tuna -Thunnus thynnus
• Relative to it’s body cells, what type of solution does the Bluefin Tuna, an ocean dwelling fish, live in?
• What does the Tuna do to protect itself from this situation?
Marine Animals
• Most marine invertebrates are osmoconformers• Most marine vertebrates and some invertebrates
are osmoregulators• Marine bony fishes are hypoosmotic to seawater• They lose water by osmosis and gain salt by
diffusion and from food• They balance water loss by drinking seawater
and excreting salts
© 2011 Pearson Education, Inc.
Figure 44.3
(a) Osmoregulation in a marine fish (b) Osmoregulation in a freshwater fish
Gain of waterand salt ionsfrom food
Excretionof salt ionsfrom gills
Osmotic waterloss through gillsand other partsof body surface
Gain of waterand salt ionsfrom drinkingseawater
Excretion of salt ions andsmall amounts of water inscanty urine from kidneys
Gain of waterand some ionsin food
Uptake ofsalt ionsby gills
Osmotic watergain throughgills and otherparts of bodysurface
Excretion of salt ions andlarge amounts of water indilute urine from kidneys
Key
Water
Salt
(a) Osmoregulation in a marine fish
Gain of waterand salt ionsfrom food
Excretionof salt ionsfrom gills
Osmotic waterloss through gillsand other partsof body surface
Gain of waterand salt ionsfrom drinkingseawater
Excretion of salt ions andsmall amounts of water inscanty urine from kidneys
Key
Water
Salt
Figure 44.3a
Freshwater Animals
• Freshwater animals constantly take in water by osmosis from their hypoosmotic environment
• They lose salts by diffusion and maintain water balance by excreting large amounts of dilute urine
• Salts lost by diffusion are replaced in foods and by uptake across the gills
© 2011 Pearson Education, Inc.
Figure 44.3b
(b) Osmoregulation in a freshwater fish
Gain of waterand some ionsin food
Uptake ofsalt ionsby gills
Osmotic watergain throughgills and otherparts of bodysurface
Excretion of salt ions andlarge amounts of water indilute urine from kidneys
Key
Water
Salt