HELP ASAP After coming back from winter break, Jimmy tells Brian that all the sparrows have left his back yard. Jimmy thinks that this is because
his dad has stopped filling the bird feeder.
Brian doesn't know for sure, but he thinks there could be a better explanation.
What might it be?
A)
That all the birds are hibernating.
B)
The sparrows have flown south for the winter
C)
That Jimmy just isn't seeing the birds that are there
D)
That sparrows are only active at night during the winter.
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the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide