The diaphragm is POSTERIOR to the thoracic cavity and ANTERIOR to the pelvic cavity.
Succrose is a DIsaccaride.
Then the model will become useless. originally the bottle should be air tight only tubes connected to the balloons, so that pressure can be shown when you adjust the plastic sheet in the bottom of the model. but now if there's a hole, air can move freely in or out the bottle and the model will not be able to show anything that occurs during respiration
Okay well the signal or the movement coming through the neuron(and its axon) is about the ions. The ion is a charged like particle, such as Na+ (If you remember that). Na+ is a sodium ion. So most of those ions I was talking about before just simply flow in or out of the cell. I hope this helps! <3