Head Definition and 7 Discussions

A head is the part of an organism which usually includes the ears, brain, forehead, cheeks, chin, eyes, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste, respectively. Some very simple animals may not have a head, but many bilaterally symmetric forms do, regardless of size.
Heads develop in animals by an evolutionary trend known as cephalization. In bilaterally symmetrical animals, nervous tissues concentrate at the anterior region, forming structures responsible for information processing. Through biological evolution, sense organs and feeding structures also concentrate into the anterior region; these collectively form the head.

View More On Wikipedia.org
Recent contents
  1. C

    Determine pump spec necessary to overcome leak

    A vacuum pump is mounted at ground level. The pump is connected to a tree of overhead pipework at a height of 20ft, connected to the pipework are 12 hose reels that can be attached to oil drain tanks. The client requests that the pump be sized so that sufficient vacuum can be achieved to suck...
  2. José Ricardo

    Medical A shot in the head turn into a man....

    Translation: A man with a mental illness tried to kill himself with a shot in the head. Instead of dying, the bullet struck the part of the brain that caused the mental disorder; he healed and became a great student in college. I know that the page is not there these things. But I have a...
  3. D

    Bulb turbine head

    Hi All, My question is about bulb turbines and head. Bulb turbines are used for tidal energy. I guess the inlet and the outlet of the turbine (or the pipe where the turbine is mounted) are both under water. Is head the difference in height between the water surface at the inlet and the water...
  4. F

    Valve open to air

    I have a centrifugal pump 50 m above a vessel, I’m pumping water in at 4 bar gauge into this vessel. I then close a valve to cease pumping ensuring no air enters the system. My question is, if I now open that same valve to atmospheric air this time, will the water exit from the pipe through...
  5. M

    How to find Mass 2?

    Homework Statement Hockey player 1 is traveling at a velocity of 12m/s North and hockey player 2 is traveling at a velocity of 18m/s south when they collide head on. after colliding, the hockey players hang onto each other and slide along the ice with a velocity of 4m/s. if hockey player 1...
  6. A

    Estimate pipe diameter based on flow rate

    I'm designing a testing unit where I need to estimate the smallest diameter of a short complex pipe (around 1 meter, three bends and some diameter viariations). Since the pipe is being cooled down in a water bath after production, my idea is to force water with a known pressure in one end of the...
  7. E

    Pressure in Pump Systems

    OK, So I have been having an on and off debate with my family about this. I saw a pump at Home Depot that said it has a 30 ft head. Then it went on to show that the flow rate varied as the output of the pump changed in height. Now I thought that this was wrong. I just finished a course in...
Top