LU3: all-or-none law

Question 1

What is the all-or-nothing law

Answer 1

The size of an action potential is not affected by the strength of the stimulus, the weaker the stimulus does not produce a weaker action potential. If the neuron receives a stimulus of sufficient strength, it fires but if weaker then it does not fire this is the all or nothing law

Question 2

What is the neural impulse

Answer 2

A signal that must be transmitted from a neuron to other cells

Question 3

Where does the neural impulse transmission take place

Answer 3

in special junctions called Synapses

Question 4

In synapses, what chemical do the terminal buttons release

Answer 4

neurotransmitters

Question 5

What is the synaptic cleft

Answer 5

A microscopic gap between the terminal button of one neuron and the cell membrane of another neuron

Question 6

What is the presynaptic neuron

Answer 6

The neuron that sends a signal across the gap

Question 7

What is the postsynaptic neuron

Answer 7

The neuron that receives the signal

Question 8

What are Neurotransmitters

Answer 8

They are the chemicals that transmit information from one neuron to another

Question 9

What are synaptic vesicles

Answer 9

Within the buttons most of these chemicals are stored in small sacs called synaptic vesicles