neurons Flashcards
1
Q
According to one estimate, the average adult human brain contains __________ neurons.
A
100 billion
2
Q
Under normal circumstances the sodium-potassium pump moves:
A
Three Na+ ions out of a neuron for every two K+ ions it moves in.
3
Q
An axon releases chemicals:
A
into the junction between neurons
4
Q
Small, charged molecules, such as potassium and sodium, are most likely to cross the cell membrane through:
A
protein channels
5
Q
What determines whether a neuron has an action potential?
A
the combined effects of EPSPs and IPSPs
6
Q
The nervous system cell which receives and transmits information is called a(n)?
A
neuron
