click below
click below
Normal Size Small Size show me how
Anantomy Stack 2
6-12
Which neuron could transmit a nerve impulse the fastest? | A large-diameter neuron with myelin |
A synaptic knob would be located on a(n): | axon. |
The fastest nerve fibers in the body can conduct an impulse that is how much faster than the slowest fibers in the body? | Almost 300 times faster |
Which is true of an action potential? | The outside of the plasma membrane is negatively charged, and the inside is positively charged. |
Within the nervous system, coding for the strength of a stimulus is accomplished through: | the frequency of nerve impulses. |
No impulse can be sent through a neuron: | during the absolute refractory period. |
Not used by the body as a neurotransmitter? | Nitric oxide , Acetylcholine , Carbon monoxide |
A slight shift away from the resting membrane potentials in a specific region of the plasma membrane is called a _____ potential | local |
Stimulus-gated channels open in response to: | sensory stimuli. |
The only ion(s) that can diffuse across a neuron’s membrane when the neuron is at rest is (are): | potassium. |
There are two types of synapses—the electrical synapse and the __________ synapse. | chemical |
When an impulse reaches a synapse: | chemical transmitters are released. |
Amino Acid : T/F : They are all inhibitory neurotransmitters. | F |
The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium-potassium pump. |
Severe depression can be caused by a deficit in certain brain synapses of: | amines |
Which of the following antidepressants acts by blocking the action of monoamine oxidase (MAO)? | Phenelzine |
Neurotransmitters are released in a synapse and bind to: | receptors on the postsynaptic neuron. |
The first event to occur when an adequate stimulus is applied to a neuron is: | some of the sodium channels at the point of stimulation open. |
When current leaps across an insulating myelin sheath from node to node, the type of impulse conduction is called: | saltatory conduction. |
T/F : The major function of the parasympathetic division is to serve as an “emergency” system. | F |
T/F : Blood vessels in both digestive organs and skeletal muscles are dilated by sympathetic stimulation. | F |
Impulses sent over which of the following tracts could result in voluntary movement, especially of the hands, fingers, feet, and toes of the opposite side? | Lateral corticospinal |
T/F : Conduction by the sixth cranial nerve results in sensations of hearing. | F |
Impulses from the _____ play a part in arousing or alerting the cerebrum. | thalamus |