Why Shark cant stop moving?

Question

Why Shark cant stop moving?

Answer 1

cuz thats just how they roll

Answer 2

it's cus they need a constant flow of oxygenated water floqing through their gills. If they stop, the won't be able to breathe.

There are some varieties that can stay still and breathe by moving their gills.

Answer 3

Sharks can't and ca stop moving.  If you saw monday's shark week, you could see that they made the shark stop moving for a min.  Also nurse sharks sleep in coral, unbelevible.  If some stop moving they can't breathe well and die and we don't want that.

Answer 4

It doesn't have an outer gill to pump the water throught its gills. It has to swim for the water to flow over the gills.

Answer 5

NOT ALL sharks need to keep moving

When it comes to oxygen intake, sharks use one (or both) of the following. One is 'buccal pumping' the other is 'ram ventilation'. Buccal pumping means that the shark draws water into its mouth and pumps it out through the gills, this is done using its 'buccal' or cheek muscles. This method requires NO forward movement and the shark can therefore be stationary and still breath. Examples of sharks that employ this method regularly are Angel sharks and Nurse sharks. The other method is one most of us are familiar with (although perhaps not in name). The majority of sharks employ 'ram ventilation' as the primary method of extracting oxygen from the water. This simply means that the shark swims along with its mouth partially open, the water rushes in and out over the gills extracting oxygen in the same way. Now as I have said the majority of sharks use ram ventilation as their primary method of breathing and indeed most 'ram ventilators' CANNOT perform buccal pumping as their facial muscles are not developed or adapted for this function. With these sharks it is ESSENTIAL that either they keep moving forward OR they must position themselves into a current sufficient to maintain a suitable amount of water flow. However, this all said sharks that use either method are both still able to rest. In the case of buccal pumping sharks, this function is maintained subconciously much like we breath subconsciously ALL the time and so these sharks can remain motionless for many hours. An experiment with a spiny dogfish (an obligate ram ventilator) indicated that swimming is coordinated by the spinal cord, not by the brain, so sharks may be able to shut down their brain and 'rest' while still swimming. Moreover, it is actually more difficult for a ram ventilator to remain still and less efficient for oxygen extraction to do so. It is also well known that if a ram ventilator needs/wants to rest it will slow to the minimum speed necessary to maintain sufficient water flow and slow down all non-essential activity, this state may be referred to as 'sleep'. So if obligate ram ventilators are stationary and water flow (e.g. a current) is insufficient to extract the required amount of oxygen, then they will indeed drown. An example of how this can and does happen is getting caught in fishing nets.

Answer 6

if they stop moving they will die because there gills wont open and then they cant breath! :-(

Answer 7

i don t get the question !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!...

Answer 8

most sharks breath by passing o2 rich water past there gills .

if they stop moving no o2 will pass and the shark will die

Answer 9

then water gets in there gils but if they move it donst  because water moves north thats wi

Answer 10

they'll drowned if they stop moving

Answer 11

There is a half-truth that sharks suffocate if they don't keep moving, but that's only for certain kinds of sharks.  Others can move water through their gills while standing still.