Most cells in the body are specialized to perform a certain task. Neurons are cells that are specialized to move messages through the nervous system. The diagram shows the parts of a neuron.

What are the parts of the neuron that are shown, in order, from A to D?

A. gland, capillaries, spinal cord, nerves

B. cell body, dendrites, axon, axon terminal

C. axon, cell body terminal, cell body, dendrites

D. cerebrum, capillaries, spinal cord, brain stem

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).