Peak temperatures in December in Hawaii can reach levels of up to 26Â°C on average. However, in 1988, Hawaii recorded its highest ever temperature in December, where the thermometer reached an incredible 31Â°C. There is no chance of a white Christmas on the beaches in Hawaii, unless you include the whiteness of the sand.
2) Synaptic Cleft: This is the narrow gap between the axon terminal of the presynaptic neuron, and the post-synaptic membrane of another excitable cell. It is filled with extracellular fluid. 3) Postsynaptic membrane: The membrane across the synaptic cleft is called the postsynaptic membrane.) A nerve impulse reaches the axon terminal of a presynaptic neuron; the membrane is depolarised by an action potential. 2) Depolarisation of the axon terminal during the action potential causes voltage sensitive calcium ion channels to open in the terminal knob.
â¢ The neuromuscular junction is the place where the terminal portion of a motor neuron axon meets a muscle cell membrane, separated by a synaptic cleft. â¢ An action potential arriving at the axon terminal brings about the release of acetylcholine, which leads to depolarization of the motor end plate.