The enzyme(s) that determines the speed of biosynthesis of major neurotransmitters in some neurons in the CNS is: Tyrosine hydroxylase only. amino acid decarboxylase only Tryptophan hydroxylase only both a) and c)
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- A patient has been exposed to the organophosphate pesticide malathion,which inactivates acetylcholinesterase. Which of the following symptoms would you predict: blurring of vision, excess tear formation, frequent or involuntary urination, pallor (pale skin), muscle twitching, orcramps? Would atropine be an effective drug to treat the symptoms?(See Clinical Impact 16.2 for the action of atropine.) Explain.How do neurotransmitters directly affect the postsynaptic neuron? A)They cause a change in the electrical potential, exciting the neuron and causing it to fire b)They cause a change in the electrical potential, either exciting or inhibiting the next neuron. C)They cause a change in the electrical potential, inhibiting the neuron and stopping it from fi d)They connect with the appropriate receptor on the postsynaptic neuronWhich one of the following is not a criterion for small neurotransmitter (NT) status? a) postsynaptic receptor sites b) it is isolated from the presynaptic cytoplasmic terminal c) predictable amount of its release d) evidence of mechanism for inactivation and termination of its biological activity
- Which statement(s) is/are true regarding the release of glutamate? (Select all that apply) Question 4 options: A) It acts by opening up Cl channels B) It can cause an EPSP in the postsynaptic membrane of a typical cortical neuron C) It can cause an EPSP in the postsynaptic membrane of a retinal neuron D) It can cause an IPSP in the postsynaptic membrane of a retinal neuronThe hormones known as "catecholamines" (adrenaline, noradrenaline, and dopamine) are not lipid-soluble. Therefore their receptor sites are: O a) On the inside of the plasma membrane O b) On the outside of the plasma membrane O c) In the cell cytoplasm O d) In the cell nucleus13) Draw a graph representing the changes in membrane potential across the axonal membrane before, during, and after an action potential. On your graph, use a highlighter to clearly indicate for which portions of your graph the letter corresponding to each cellular event listed below belongs. List of cellular events: A) All K* channels open B) All Na* channels close C) The Na*/K* ATPase cotransporter transports Na* and K* across the membrane. D) All Na* channels open E) The threshold value of membrane potential is attained. F) All K* channels close G) Some Na* channels open Your graph:
- Represent the reactions when Phosphatidylethanolamine was treated with; (i) Phospholipase C (ii)Phospholipase DInhibitory neurotransmitters are expected to A) close potassium channels.B) hyperpolarize the postsynaptic membrane.C) close chloride channels.D) open sodium channels.E) hyperpolarize the presynaptic membrane.Describe how nitric oxide and endocannabinoids function as neuromodulators.
- Autism is a condition that is generally characterized by difficulties in communicating, understanding abstract concepts, and forming relationships with other people. Recent studies show that children with autism tend to have low levels of oxytocin. Oxytocin nasal spray has been tried as a medical intervention. List two main functions of oxytocin in the body.Glutamate's effect when it binds with protein receptors on the post synaptic membrane is to: a. Initiate movement of potassium ions out of the membrane b. Initiate movement of sodium ions into the membrane c. Initiate movement of sodium ions out of the membrane d. Initiate movement of potassium ions into the membrane GABA is an example of an inhibitory neurotransmitter. Drugs that increase the level of GABA are used to treat diseases such as epilepsy where the signal transmission needs to be impaired. The effect of the inhibitory neurotransmitter on the postsynaptic membrane is to: a. hyperpolarize the postsynaptic membrane b. decrease the threshold level c. depolarize the postsynaptic membrane d. maintain the resting potential Calcium is vital for bone growth, but it's also an important part of neural transmission. Calcium is required for the axon terminal to: a. Reuptake the neurotransmitter via exocytosis b. The neurotransmitter to be released by endocytosis c. The neurotransmitter…A neurotransmitter is a chemical messenger that carries, boosts, and balances signals between neurons, nerve cells, and other cells in the body. a) Identify two disorders that can result in a depletion, damage, or lack of neurotransmitters in our body. Then list and explain at least two neurotransmitters that can result in these disorders developing.