Which of the following is a consequence of myelination in large nerve fibers?
A: Decreased velocity of nerve impulses
B: Generation of action potentials only at the nodes of Ranvier
C: Increased nonselective diffusion of ions across the axon membrane
D: Increased membrane capacitance
A: Decreased velocity of nerve impulses
B: Generation of action potentials only at the nodes of Ranvier
C: Increased nonselective diffusion of ions across the axon membrane
D: Increased membrane capacitance
举一反三
- The myelin sheath of the peripheral nerve consists of A: Schwann cell membrane and cytoplasm B: only Schwann cell cytoplasm C: multiple layers of Schwann cell membrane D: only the lipid of Schwann cell membrane E: Schwann cell membrane and basal lamina
- The best choice as a significant consequence of the Crusades is which of the following? A: Decreased influence of the Church B: Increased interest in exploration C: Increased value of the common man D: Discouraged international trade
- Which of the following can relax muscles? A: activate Ca2+ channels of nerve endings B: promote ACh release of nerve endings C: activate ACh receptor-gated channel on the endplate membrane D: activate cholinesterase in the gap of the linker
- Through which of the following structure does nerve fibers conduct nerve impulses? A: Myelin sheath B: Axolemma C: Neurofilament D: Synaptic vesicle
- In a patient given a cardiac glycoside, which of the followings is/are important effects of the drug on the heart? A: Decreased atrioventricular conduction velocity B: Increased intracellular calcium C: Increased ectopic automaticity D: Increased force of contraction