1 Angina Pectoris: It is described as a pain located at the back of the breast bone which may be sharp or dull. This sensation may radiate or crawl to the hand, arm, left shoulder, or jaw.  Vasculitis: When the small to medium sized arteries are inflamed, head tingling and numbness may result.
Most species of shark eat things like fish, crustaceans, mollusks, plankton, krill, marine mammals and other sharks. Sharks also have a very acute sense of smell that allows them to detect blood in the water from miles away.
Smell is probably the most important shark sense, so much so that sharks have been referred to as swimming noses [source: SeaWorld]. There are some impressive statistics to back this up, too. A shark can sniff out fish extracts that make up only one part for every 10 billion parts [source: Elasmodiver]. Other research shows sharks are able to respond to one part blood for every one million parts of water; this is like being able to smell one teaspoon of something in a swimming pool [source: Shark Trust]. What's more, sharks can smell these small amounts from hundreds of meters away [source: SeaWorld].