Opening of voltage-gated sodium channels in the membrane of a neuron results in

A) depolarization.
B) repolarization.
C) hyperpolarization.
D) increased negative charge inside the membrane.
E) myelination.


A) depolarization.

Anatomy & Physiology

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A complete lesion of the oculomotor nerve would produce all of the following signs except:

A) ptosis. B) absence of pupillary light reflex. C) pupillary constriction. D) abducted and laterally directed eyeball. E) absence of accommodation reflex.

Anatomy & Physiology

During an action potential, an increase in membrane permeability to Na+ leads to a _______ followed by an increase in permeability to K+ that leads to a _______ of the membrane and a slight afterhyperpolarization.

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology

Elliot thought that his peptic ulcers were caused by his nagging parents, and was surprised when the doctor handed him a prescription for medication to treat

A. a bacterial infection. B. a too high pH. C. excess bile. D. a viral infection.

Anatomy & Physiology

The contractile organelles of a skeletal muscle fiber are thread-like structures called

a) myofibrils. b) myoglobin. c) mitochondria. d) Z discs. e) M lines.

Anatomy & Physiology