Some neurotoxins and local anesthetics work essentially the same way, which is to
(B) bind to Na+ channels and inactivate them and (C) prevent depolarization by blocking Na+ entry into the cell.
The brachial plexus consists of branches of the last 4 cervical and the 1st thoracic spinal nerves. T/F?
When a second EPSP arrives at a single synapse before the effects of the first have disappeared, what occurs?
Which of the following does not apply to Wernicke's area?
is responsible for controlling the muscles necessary for speaking ability
Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors. Why?
There are no enzymes to break down epinephrine and norepinephrine in the blood and very little in peripheral tissues
The presence of glucose _________or _________in CSF suggests infection. Choose from the following: 1.glucose 2.protein 3. K+ 4. H+ 5. blood cells
protein, blood cells
respond to acetylcholine released from both sympathetic and parasympathetic preganglionic fibers.
In comparing the outside (extracellular space) with the inside of the neuron (intracellular space) the outside is :
positive with respect to inside and negative with respect to inside when the action potential spreads over the nerve
The direct cause of the resting potential is:
difference in concentration of positive and negatively charged ions in the intra and extra cellular fluids
When graded potentials reach the trigger zone,
an action potential may be initiated, they may depolarize the membrane to the threshold voltage, they may hyperpolarize the membrane; they may be called EPSP's or IPSP's