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by BlastRoom
How a signal crosses the gap, and what the named neurotransmitters do.
#us_hs_anatomy_physiology
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At a chemical synapse, an action potential reaches the axon terminal and opens voltage-gated channels in its membrane. What happens immediately next?
Calcium has entered a presynaptic terminal after an impulse arrives. What event comes next at that terminal?
A transmitter has just left the presynaptic cell into the narrow space between two neurons. What happens next?
Transmitter molecules are in the gap beside a receiving neuron's membrane. What must they do to affect that neuron?
An excitatory receptor on a receiving neuron opens sodium channels after a transmitter attaches. What happens immediately to that membrane area?
A receiving neuron depolarizes to threshold at its axon hillock after inputs from synapses add together. What happens next?
At the junction between a somatic motor neuron and a skeletal muscle fiber, which transmitter is released by the neuron?
A preganglionic autonomic neuron communicates with the next neuron in a ganglion. Which transmitter does it release?
Sympathetic fibers make most small arteries constrict during a stress response. Which transmitter do they release onto that smooth muscle?
During exercise, sympathetic fibers speed pacemaker cells in the sinoatrial node. Which transmitter acts on that cardiac target?
Signals in basal nuclei circuits that help start smooth voluntary movement depend heavily on which transmitter?
In a brain reward pathway, a rise in which transmitter often reinforces a behavior?
The raphe nuclei in the brainstem send fibers through the brain that help regulate mood and sleep. Which transmitter do they release?
An enzyme in the synaptic cleft splits acetylcholine after it has acted on a muscle fiber. What does this accomplish?
A transporter moves dopamine from the cleft back into the presynaptic terminal. What is the direct effect at the receiving membrane?
Serotonin is taken back into the sending neuron's terminal after binding receptors. What does that removal do?
Some transmitter molecules drift away from the cleft instead of staying near receptors. What is the effect on that synapse?
A toxin prevents vesicles in a motor nerve terminal from releasing their contents. What would the served skeletal muscle do?
A blocker occupies acetylcholine receptors on salivary gland cells that parasympathetic fibers normally activate. What follows?
A chemical prevents calcium from entering an axon terminal when an impulse arrives. What follows at that synapse?
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Regions of the Brain and What They Control
50 questions
