James

**​How Sharks Can Smell Blood PowerPoint -**
==http://kirbyville.k12.mo.us/gaines/Summer School 10/great white shark/How sharks can smell blood.ppt==

**Who will you learn with? Myself. **
==**What will you use to learn? Sites and  books . **==

==**I think this is a good topic. You were very specific in what you want to know. You can start with this site and I will look for some others. Mrs. Gaines :-) **==

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@http://www.ehow.com/how-does_4579345_shark-smell-blood-miles-away.html @http://www.enchantedlearning.com/subjects/sharks/anatomy/Senses.shtml @http://animals.nationalgeographic.com/animals/fish/great-white-shark.html [] []

notes: How does the shark do this? Just under the snout are two **nostrils.** Each nostril has two openings, one for water to enter and one for water to exit. The shark sucks or pulls the water into the nostrils to sniff out any evidence of prey. The water goes into nasal sacs and over a series of skin folds. The nasal cavities are big spaces, which gives the shark more time to recognize the smells. The nasal sacs are filled with sensory [|cells], which send signals to the shark's brain. The shark's brain figures out the smells, looking for those that match the scent of their prey or the the smell of might want to mate. And sharks have pretty advanced equipment up there -- about two-thirds of the shark's brain weight is used for sense of smell[source: [|Shark Trust]]. Once the shark knows the scent and decides to follow, it starts swimming. The shark's natural swimming motion of moving its head back and forth provides further assistance in determining where the scent is coming from. With each movement, the snout picks up more water for the shark to figure out, and the shark is able to tell whether it's coming from the right or left nostrils. This helps them determine which way to swim. The shark's nose may work so well because it doesn't have to do anything else. Sharks use their noses just for smelling. Breathing is accomplished with a shark's gills, and the shark's sense of smell is not connected to its mouth in any way. Sharks often don't know how something is going to taste until they've taken a bite. This is how some people are able to "escape" from a [|shark attack] -- the shark gets a little nibble of a foot and decides to reject the prey.