The most accurate description of SPATIAL summation is
A. Several inputs from DIFFERENT presynaptic cells create EPSPs that sum together to bring the neuron over the threshold for an action potential.
B. Several inputs from the SAME presynaptic cell arrive in rapid succession, summing into a larger depolarization that brings the neuron over the threshold for an action potential.
A. Several inputs from DIFFERENT presynaptic cells create EPSPs that sum together to bring the neuron over the threshold for an action potential.
Both types of summation allow for ‘grading’ of nervous response – if the stimulation affects too few presynaptic neurons or the frequency of stimulation is too low, the impulse is not transmitted across the cleft.
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A) hemorrhagic diarrhea. B) liver failure. C) brain damage. D) hemorrhagic diarrhea, liver failure, and brain damage.
Which number identifies the proximal promoter?
a. 1 b. 2 c. 3 d. 4 e. 5
The atomic number of an atom is the number of
a. neutrons b. protons c. neutrons and protons d. electrons an outer shell e. neutrons and electrons
During the early part of the cleavage stage in frog development, the rapidly developing cells
A) skip the mitosis phase of the cell cycle. B) skip the S phase of the cell cycle. C) skip the G1 and G2 phases of the cell cycle. D) rapidly increase the volume and mass of the embryo. E) skip the cytokinesis phase of the cell cycle.