How would a chemical that prevents the opening of voltage-regulated Na+ channels affect the function of a neuron?
A) The neuron will only be able to hyperpolarize.
B) The neuron will depolarize more rapidly.
C) Action potentials will lack a repolarization phase.
D) The neuron will automatically and repeatedly produce graded potentials.
E) The neuron will only be capable of producing graded potentials.
E
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Bending the trunk forward at the intervertebral discs is an example of what type of angular movement?
a) Flexion b) Extension c) Lateral flexion d) Hyperextension e) None of these choices
The type of bond formed when atoms share electrons unequally is termed ________.
A. nonpolar covalent B. polar covalent C. ionic D. van der Waals
The first pair of ribs are joined to
A. T12, the last thoracic vertebra. B. T1, the first thoracic vertebra. C. T2, the second thoracic vertebra. D. C7, the last cervical vertebra and the clavicles.
Within the embryonic disc, the epiblast gives rise to which of the following germ layers?
A. Endoderm and ectoderm only B. Mesoderm and ectoderm only C. Endoderm and mesoderm only D. Endoderm, mesoderm, and ectoderm