How to live without a heart or a brain - Lessons from a Jellyfish

The jellyfish is one weird sea animal. What makes it even weirder is that it doesn’t have a brain or a heart. Though it doesn’t have a brain, it does have a nervous system in the form of nerve nets and some have a structure called a nerve ring. This allows the jellyfish to reflexively respond to its surroundings. Some jellyfish like box jellyfish even have structures similar to a human eye that can see in 3-D images located inside the edge of their bell. The jellyfish also don’t have a heart and neither do they need it. In animals with a heart, the heart functions to distribute oxygen and nutrients throughout the body. For the jellyfish, oxygen simply diffuses from the water into their cells. Similarly with food, the jellyfish has a rudimentary stomach, called the gastroventricular cavity where food is digested and nutrients are directly absorbed into the jellyfish. *Nature or evolution aren’t conscious decision makers, designing life as they see fit. Evolution is a phenomenon where random genetic mutations create changes in traits over many generations. References: anatomy digestion&hl=en&sa=X&ved=0ahUKEwiAsMTEodTpAhVROSsKHWZNAV0Q6AEIKDAA#v=onepage&q=jellyfish anatomy digestion&f=false (13)00359-X   #science #funfacts #jellyfish Music Credits: Envato Elements/Documentary Voiceover Background Loop by bdProductions Video Credits: Envato Elements/Pixabay/Pexels Image & Vector Credits: Envato Elements & Hand vector created by freepik - :Anthracomedusa_turnbulli_fossil_jellyfish_(Mazon_Creek_Lagerstatte,_Francis_Creek_Shale,_Middle_Pennsylvanian;_coal_mine_dump_pile_near_Essex,_northern_Illinois,_USA).jpg : : : #/media/File: Original Article Link: If you wish to buy/license this video, please write to us at admin@. Voice Over Artist: John Staughton ( ) SUBSCRIBE to get more such science videos! Follow us on Twitter! Follow us on Facebook! Follow our Website!