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30 Cards in this Set

  • Front
  • Back
What are the 6 senses of a shark?
1. Touch
2. Taste
3. Hearing
4. Sight
5. Water Pressure
6. Electricity
A shark's primary sense is a keen sense of ________.
What is the ratio of the minimum number of drops of blood to the number of drops of water the blood is found in, for a shark to trace?
How far away can a shark trace a scent of blood?
.25 mile
Where are a shark's paired nostrils found?
The underside of its snout.
How does the the shark get its olfactory information?
Water continually flows through the nostrils.
How is the job of a shark's nostrils different than ours?
Shark's nostrils is for scent only, while ours is connected to the mouth so we can breathe too.
What are nasal barbels?
Whisker-like feelers used to taste and feel.
What are the manin parts of a shark's eye?
Spherical lens, a cornea, a retina, an iris, and a pupil.
What animal's eyesight is a shark's most similair? And why?
Like cats who also see well in dim light.
What is the tapetum lucidum?
A mirror-like layer in the back of the eye.
What does the tapetum lucidum do?
It doubles the intensity of incoming light, enhancing light sensitivity.
How is a shark's pupils unlike other fish's?
It can dilate and contract to control the amount of incoming light.
Why are sharks very sensitive to small differences in light intensity?
The retina has a greater proportion of rods (light intensity sensors) than cones (color sensors).
What is a a nictitating membrane and what does it do?
A type of eyelid that protects the eye during hunting.
What is the difference between the eyes of sharks that live in different depths of the ocean.
Sharks that live deeper in the oceans usually have larger eyes than those that live nearer the surface.
Why is the fact that sharks can detect electricity important?
It is emitted in small amounts by every living animal including the prey or the shark.
Sharks have a special network of jelly-filled canals in their head called the _______________that detect electric fields.
Ampullae of Lorenzini
What does the Ampullae of Lorenzini do?
Lets the shark pick up weak electrical stimuli from the muscle contractions of animals.
How does a shark navigate?
It detects magnetic fields to determine which way to travel.
Sharks can sense vibrations in the water using __________ _________.
The lateralis system
What are the lateralis system?
It's a network of neuromasts, fluid-filled vessels, that run along a shark's body under the skin along the length of a shark.
What does the the lateralis system do?
Many small pores open up on the skin and detect the intensity and direction of vibrations in the water.
How does this help the shark?
The shark can detect injured fish (easy prey) that are thrashing around in the water.
Sharks are very sensitive to ___ frequency sounds and have good directional hearing.
What serves as a shark's external "ears"?
The endolymphatic pores on the top of a shark's head.
Where is a shark's tastebuds found?
Sharks have taste buds in the mouth but not in their tongue.
A shark's tongue is called a __________.
What is a basihyal?
A small, thick, relatively immovable piece of cartilage that is found on the floor of the mouth of sharks and fishes.(It's tongue.)
What is the only shark that uses its tongue and why?
The cookiecutter sharks use it to suk the guts out of its prey.