2 ms·A human has 21B neurons. A house cat has around 250M. So let's draw the line around there.by muzani 3y agoA human has 21B neurons. A house cat has around 250M. So let's draw the line around there.rcarmo 3y agoThe cat appears to be much more efficient, given that it can farm out tasks to the human consistently.ls612 3y agoHumans have 85-100B neurons in the brain and another many more in the spine and other CNS bits.