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A nerve impulse is

a) a short burst of weak electricity along a nerve fiber.
b) a series of distinct membrane excitations along a nerve fiber.
c) the rapid axonal transport of vesicles down a nerve fiber.
d) the twitch of a nerve fiber

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Related questions

1.If the supply of ATP to a shortening muscle is completelydepleted, what will happen to the cross-bridge cycle? What is thename if the phenomenon that results from complet ATP depletion?

2.Order the following 10 events that summarize musclecontraction. Remember that a muscle contraction begins with thetransmission of a nerve impulse to a muscle fiber

a. the power stroke

b. Opening of ryanodine Ca2+ channels in the sarcoplasmicreticulum

c. Binding of mysosin cross-bridges to actin

d. release of acetylcholine into the neuromuscular junction

e. confromational change in tropomyosin troponin complex

f. binding of ca2+ to troponin

g. binding of atp to myosin cross-brisges

h. depolarization of the muscle fiber

i. hydrolysis of atp bound to myosin cross-bridges

j. action potential propagation along the transverse tubules

59. Saltatory Conduction

a. occurs in unmyelinated nerve fiber

b. is slower than conduction by local current flow because the myelin acts as an insulator to show the impulse down

c. involves the impulse jumping from one node of ranvier ro adjacent node

d. refers to the action potential spreading from one schwann cell to the adjacent schwann cell.

e. more than one of the above is correct

63. the universal energy currency in cells is

a. RNA b. ATP c. Glucose d. Glucogen e. DNA

66. which of the classes of hormones triggers the synthesis of new intracellular proteins within the target cell (via stimulation of DNA transcription and translation)?

a. peptides b. catecholamines c. steroids d. thyroid hormone e. both c and d are correct

68. hormones,

a. are all similar chemical composition

b. combine with specific receptors on the target cell's surface or inside the target cell

c. are secreted at a constatnt rate

d. all act by activating adenyl cyclase, which transforms ATP into cAMP

e. all of the above are correct

The images of objects being closely examined fall on the

a. optic disk

b. fovea centralis

c. oraserrata

d. blind stop

e. sclera

The lateral geniculate body in the Thalamus probably interprets

a. color and depth perception

b. direction of orientation of lines and borders

c. the finer meaning of the image

d. contrast in images

Which one of the following is correct?

a. downward movement of the basilar membrane causes the hair cells to depolarize

b. high frequency sounds cause maximum movement of the basilar membrane near the base of the cochlea

c. the hairs of the sensory cells of the organ of corti are embedded in the basilar membrane

d. the amplitude of a sound wave decreases as it travels along the basilar membrane

Choose the false statement about the semicircular canals

a. they are located in the inner ear

b. they sense acceleration or changes in position

c. nerve impulses begun here are conveyed to the brain by the vestibular branch of the cranial nerve VII

d. there are 4 semicircular canals in each ear

e. each canal has an enlarged portion called an ampulla

<True or False>

Crista, macula, otholith, and spiral organ of corti are all structures located in the inner ear.

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