The reason that diameter of an axon affects the speed of conduction is a. The la

Question

The reason that diameter of an axon affects the speed of conduction is a. The larger diameter means there are more voltage-gated channels present, so they open faster. b. The larger diameter means there is more water present in the cell, allowing for faster ion diffusion. c. The larger diameter means that the current of graded potentials travels faster with less decrement, thus firing an action potential simultaneously in a larger segment of membrane at one time. d. The diameter of an axon has no relationship to the speed of conduction of action potentials down the axon. In saltatory conduction down myelinated axons, a. The signal under the myelin is an action potential and the signal at the nodes is current inside the cell. b. The signal under the myelin is current in the cell and the signal at the nodes is also simply current inside the cell c. The signal under the myelin is an action potential and the signal at the nodes is an action potential also. d. The signal under the myelin is current inside the cell and the signal at the nodes is an action potential. A synapse (B) that modifies activity in a nerve terminal (A) to reduce release of neurotransmitter from the nerve terminal (A) onto its post-synaptic cell is called a. An autoreceptor b. Desensitization c. Long term potentiation d. An axo-axonic synapse e. An antagonist Release of neurotransmitter from a pre-synaptic cell requires a. Opening of voltage-gated Ca channels on the synaptic nerve terminal b. Opening of voltage-gated Na channels on the synaptic nerve terminal c. Opening of voltage-gated K channels on the synaptic nerve terminal d. Opening of ligand-gated Ca channels on the synaptic nerve terminal e. Opening of ligand-gated Na channels on the synaptic nerve terminal The enzyme that degrades norepinephrine in the synaptic cleft is a. Phosphodiesterase b. Acetylcholinesterase c. Monoamine oxidase e. Phospholipase C

Explanation / Answer

41. A.

The larger the diameter means there are more voltage gated channel present conduction speed is directly proportional to the square root of diameter connection speed can be more precise when the axon are myelinated .

42.d

The signal under the mylan is current inside the axon and the signal at the end of the node of ranvier is action potential

43.E antagonist .

44. A

Opening of the voltage gated Ca channels.

45. c monoamine oxidase.

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