The most accurate description of TEMPORAL 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.
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.
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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Which one of these mollusk groups can be classified as suspension feeders?
A) bivalves B) gastropods C) chitons D) cephalopods
The first true hominids in the fossil record are
(a) Australopithecus. (b) Homo habilis. (c) the chimpanzee. (d) Homo sapiens.
If your mother and father both are healthy but carry the allele for cystic fibrosis, which is caused by a recessive allele,
the odds of you inheriting at least one allele for the disorder are ____.
a. 1/4 b. 1/2 c. 3/4 d. 1 e. 0
During the Cretaceous period, ____
a. mammals diversified and flourished b. life appeared on this planet c. the first animals with shells and skeletons appeared
d. the dinosaurs reached their peak and then became extinct e. the first human-like apes appeared