Breathing Underwater

As mentioned before, sharks are fish, and therefore require movement to breathe because water has to flow through their gills so it can be converted into oxygen. Some shark are able to pump water to their gills using strong cheek muscles and wide spiracles at the side of their head, however the Great White Shark is more evolved. It developed a style of breathing called obligate ram ventilation. This means it is mandatory for the shark to be moving constantly or it will drown.

Work Cited: (2012). Shark Breathing: Buccal Pumping and Ram Ventilation. Retreived From: http://science.howstuffworks.com/environmental/life/zoology/marine-life/shark-drown1.htm

JAWS

The Great White Shark has knifelike teeth with two to three rows on top and bottom of their jaws. They have 26 teeth in each row at the top and 24 in each row at the bottom. Whenever a shark loses a tooth in feeding or fighting, another one grows in called the pop up tooth. The Great White Shark’s (GWS’s) teeth are large, triangular, and serrated used for cutting and tearing the flesh and meat off their prey. Their teeth are not firmly set in their jaws like human adult teeth, sharks lose many teeth and therefore grow a new tooth every nine days. These teeth are larger than the last allowing room for growth.

 

Work Cited: Harris. T. H. Great White Sharks and More. Retrieved From: http://www.sealifepix.com/greatwhitesharks.html

Heart of an Athlete

The Shark’s heat is very similar to the human heart in how it works, but it is laid out a bit differently. Like a human it has a four chambered heart but the components are the sinous venosusauricle, ventricle, and the conus arteriosus.  Shown in the picture below.

The Heat located behind the gills, pumps the oxygen blood collected there throughout the body into working tissues, like the human SA &VA node , the sinous venosus controls the heart contractions. The Auricle is like our atriums which collect the blood in its chamber. When the blood reaches the ventricle in a white shark, its thick muscle walls squeeze the blood into vessels that are carried throughout the body contains capillaries and veins, making a pass through the gills to collect oygen and back to the heart. It is unsure what the conus arterious ‘s function is in the heart, but it’s structure suggest that it prevents backflow of blood into the heart.

Work Cited : Martin. A. M. Heart of an Athlete. Retrieved From: http://www.elasmo-research.org/education/white_shark/heart.htm

They can smell other blood, but what about their blood?

The Great White Shark is interesting because its blood temperature is almost always warmer than the water surrounding it. Scientists say this allows for easier and faster digestion of food. This is due to its modified circulatory system, which is a bonus for being cold blooded. The heating up of he sharks anatomy is called regional endothermy, and works on places where most of the nerves are. This allows the big fish better vision, and movement due to heated muscle. Due to excess amounts of hemoglobin in the sharks blood, this is an indicator for a higher metabolism aswell.

 

Work Cited : Harris. T.H. Great White Sharks and More. Retrieved From: http://www.sealifepix.com/introduction.html

Roesch. B. R. (1997) White Shark Physiology: Warm Bodied and Ready to Go. Retreived from : http://web.ncf.ca/bz050/wsphysio.html

 

The Constant Mover

As in my previous post, we know that sharks move by moving their tail ( anal and caudal) from side to side pushing the shark forward. They do not stop because the way they breathe is through gills which need constant water flow to pick up oxygen into the blood stream. It is for this reason that the Great White Shark cannot live in captivity, or stop for long period of time. The Great White Shark has no ability to back up or reverse, it constantly moves forward. It can turn around, which it often does while circling it’s prey. This leads to why it needs to move quickly, it hunts. This style of movement is ideal for a predator because it allows for sharp turns and bursts of speed. In leisure it swims 1-2 miles per hour but on the hunt or in the need for speed it can reach up to 35 miles per hour(in short bursts). Man oh man, humans can only swim up to 25 miles per hour on average. Its a good thing we’re not their top choice of food.

Work Cited: Harris. T.H. Great White Sharks and More. Retrieved From: http://www.sealifepix.com/introduction.html

 

The Importance of A Great White Shark’s Tail & Fins

The Great Shark is a majorly known shark species, and it’s their famous dorsal fin that have beach go-ers scanning the water before going swimming. The pectoral fins, or the fins on the side of the shark are what helps it to direct its body towards the surface 0r deeper down into the ocean. Its, moved by very stong muscles is what gives the Great White Shark its speed. It can move the shark at a pace of 24km/hour, and in short burst up to 40km/hour. The tail sweeps side to side , and when competing for food is often used as a weapon to push other sharks out of the way.

Work Cited: Ryan. E.R. Great White Sharks. Retrieved From :http://www.superteacherworksheets.com/reading-comp/5th-greatwhitesharks.pdf

Image Work Cited : Barraud. M. B. (18 June 2009). Malaria, freak storms and great white sharks: what may lie ahead for th UK. Retreived From :http://www.guardian.co.uk/environment/2009/jun/18/climate-change-scienceofclimatechange

The Great White’s Skeleton & Composition

Like all other Sharks, the White Shark’s Skeleton is cartilaginous, allowing for great flexibility. Having a mostly cartilage skeleton, these sharks can turn and snap very easily. The Great White is Torpedo shaped, and has normal assortment of dorsal, anal, and paired Fins. It is usually 3 1/2 to 5 meters long.

Work Cited : (1998-2012). Retrieved From: http://www.sharkfriends.com/sharks/greatwhite.html

Retrieved From: http://australian-animals.net/shark.htm

Skin, and why its important.

Although having the name “Great White” Great White Sharks are mostly grey, but have a white under belly. While looking smooth to touch, these enormous fish have scales too, but they are called Denticles. These Denticles are important because the can depict how fast a shark and move through water huinting its prey. They look like teeth, instead of scales, and decrease drag and turbulance. This adaptation allows the Great White Shark to swim more quickly and quietly.

Work Cited: Sewell. T.S. Retrieved From : http://ocean.si.edu/ocean-photos/biomimicry-shark-denticles

Image Image Work Cited: (1985-2010). Retrieved From: http://seapics.com/feature-subject/sharks/great-white-shark-pictures-003.html