You eat something that is very sour and immediately take a sip of a sweet soft drink to counteract the taste.What is the difference in the activation of gustatory receptors for these two tastes that allows you to distinguish them efficiently.a. Sour triggers the activation of serotonin to be released into the synapse while sweet activates a GPCR that leads to ATP activating primary sensory neurons. Both rely on second messenger Ca?*b. Sour triggers the activation of ATP activating primary sensory neurons while sweet activates the release of serotonin into the synapse. Only sweet relies on second messenger Ca?*c. Both sour and sweet result in serotonin release to primary sensory neurons, that is why the distinction happens so quickly.d. Both sour and sweet result in only the activation of ATP as a ligand to the primary sensory neuron, that is why the distinction happens so quickly.
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Which of the following event does NOT occur when you eat the lemon slice (i.e. very sour food) that came in your glass of water? A Action potentials travel along the primary, secondary, and tertiary sensory neurons to the gustatory cortex. B Intracellular concentration of Ca2+ increases C G-protein coupled receptors are activated and produce second messengers D H+ ions enter the taste receptor cell through receptor-channels. E Serotonin is released as a neurotransmitter from the taste receptor cell.
Madhur L.
2. What is one main difference between ionotropic and metabotropic receptors? A. Metabotropic receptors form ion channel pores for direct movement of ions, whereas ionotropic receptors don't. B. Only metabotropic receptors can be activated by neurotransmitters. C. Ionotropic receptors form ion channel pores for direct movement of ions, whereas metabotropic receptors don't. D. Activators of ionotropic receptors are called agonists, whereas activators of metabotropic receptors are called antagonists. 3. Which of the following statements about loading synaptic vesicles with neurotransmitter (NT) molecules is INCORRECT? A. The loading of synaptic vesicles with NT is facilitated by a proton gradient. B. The inside of the synaptic vesicles is acidified prior to loading. C. Loading of NT is preceded by the activity of the vacuolar hydrogen ATPase. D. The vesicle sodium/potassium ATPase establishes a sodium gradient needed to load NT into vesicles. 4. Which statement about exocytosis of neurotransmitter-filled synaptic vesicles is INCORRECT? A. Vesicles have to be docked and primed before they can be exocytosed. B. SNARE proteins interact in order for fusion to take place. C. Synaptotagmin is a T-SNARE protein, which acts as a calcium sensor. D. Calcium enters the terminal in close proximity to vesicles' location.
Adi S.
Tasting something "sweet" versus "salty" is a result of activating a. different sensory receptors. b. many versus few sensory receptors. c. no sensory receptors. d. None of these are correct.
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