We have 5 senses to detect changes in the environment around us. These changes are known as __________ and we have __________ in different organs to detect them:
We can also detect changes inside our body for example __________ (Thermoception) and __________ level.
The nervous system is split into two parts called the periphal nervous system and the central nervous system.
The periphal nervous system (PNS) consists of:
The central nervous system (CNS) consists of:
Information from the __________ is sent to the brain via the __________, along __________ neurons (nerve cells). 'Messages' are sent along the neuron as __________ impulses.
The commands are sent to __________ via the __________, along __________ neurons causing a __________. The effectors may either be __________ or __________.
The __________ will contract, to move the body. The __________ secret (release) chemical into the blood called __________, which affect other organs.
When the sensations are intense, like pain or extreme heat, then our body reacts before our brain knows about it. This is known as a __________. A __________ neurone in the __________ 'short circuits' the gap between the __________ neuron delivering the 'message' and the __________ neuron connected approprate the muscle. The information is also sent to the brain so we 'know' what has happened.
The junction between neurones is called a __________. For the 'message' to cross the gap between neurons a chemical called a __________ is released from one and absorbed by the next which triggers an __________ impulse.