Answer:
plasma membrane/ cell membrane
Vein because they have valves to prevent back flow of blood.
It is were the waste in your body comes out eg. urine, snot and sweat.
Answer:
The increased activity prior to the saccade reflects a shift in attention to the stimulus inside that neuron's receptive field.
Explanation:
They observed that the neurological basis of attention, first made in the superior colliculus has been extended to a number of areas in both the dorsal and ventral streams.
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