Biology Nervous System questions

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Transmission across a synapse is dependent on the release of neurotransmitters. At least 25 different neurotransmitters have been identified, but two very well-known ones are acetylcholine (ACh) and
norepinephrine
The following describes (in no particular order) the steps involved in transmission across a synapse:
1. acetylcholine molecules are released into the synaptic cleft
2. cholinesterase breaks down acetvicholine
3. nerve impulse reaches axon bulb
4. excitatory impulse is generated in postsynaptic neuron
5. gated channels for calcium (Ca-*) ions open
6. acetylcholine molecules bind to postsynaptic membrane
7. Lise of [Ca?- ion] stimulates synaptic vesicles to füse to the pressnaptic membrane
8. acetvicholine diffuses across the svapse to postsvnaptic neuron

The steps in the transmission of a neurotransmitter across a synapse shown above are not in the correct order. The correct order for the last four events in this sequence is _____, _____, _____, and _____ . Record your four-digit answer in the answer space.

Post Merge: A year ago

Selective Serotonin Re-uptake Inhibitors (SSRIs)
The complexity of the brain has alwavs formed a barrier to the treatment of disorders of the mind. An understanding of the brain's neurotransmitters allows scientists an opportunity to treat a number of neurological problems. Selective serotonin re-uptake inhibitors (SSRIs) are a newer class of
antidepressant medications. The first drug in this class was fluoxetine (Prozac™M). Certain neurotransmitters are associated with depression, including the neurotransmitter serotonin (ser-oh-TOE-nin). Drugs have been developed to stimulate or inhibit specific neurotransmitters. For example, ProzacIM an antidepressant, enhances the action of the neurotransmitter serotonin. Some research suggests that abnormalities in neurotransmitter activity affect mood and behaviour. SSRIs seem to relieve symptoms of depression by blocking the reabsorption (re-uptake of serotonin by certain nerve cells in the brain. This leaves more serotonin available in the brain. As a result. this
enhances neurotransmission-the sending of nerve impulses and improves mood. SSRIs are called
"selective" because they seem to affect only serotonin, not other neurotransmitters such as GABA. GABA is a neurotransmitter that acts as a natural "nerve-calming" agent. It helps keep the nerve activity in the brain in balance, and is involved in inducing sleepiness, reducing anxiety, and relaxing
muscles

Based on the information above depression has been linked to a neurotransmitter imbalance. Based on the information above, this disorder is most likely linked to
Question 39 options:

A.high levels of GABA.

B.low levels of seratonin

C.low levels of GABA.

D.high levels of seratonin

#39

B.low levels of seratonin


8, 6, 4, 2

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