Channels of the TRP family are required for sensing stimuli in many organisms. T
ID: 3455926 • Letter: C
Question
Channels of the TRP family are required for sensing stimuli in many organisms. TRPQ is member of this family and opens in response to heat. TRPQ is a nonspecific cation channel and is found in the sensory neurons that detect heat. Sensory neurons like other neurons can fire action potentials. Suppose that you conduct an experiment with a type of worms that have TRPQ channels in their sensory neurons. You exposed the worms to heat;
1. Ca++ :
a. flows out of the cell b. flows in to the cell c. shows no significant movement across the membrane
2. Na+ :
a. flows out of the cell b. flows in to the cell c. shows no significant movement across the membrane
3. Cla :
a.flows out of the cell b. flows in to the cell c. shows no significant movement across the membrane
4. You expect the cell to become : a. hyperpolarized b. depolarized
Please, justify your answer for each question part
Explanation / Answer
1. CA++ : b. flows into the cell.
When the action potential reaches the axon ending, it causes the calcium ion (Ca++) to enter the cell, which in turn causes the vesicles to release neurotransmitters into the synaptic gap.
2. Na+ : b. flows into the cell.
When a neuron is fired, the sodium gates respond by opening and letting positively charged sodium ions in, so that the inside starts to become less negative and ultimately positive.
3. Cla : c. shows no significant movement across the membrane.
The Cla is not involved in this process.
4. You expect the cell to become : b. depolarised.
This is because the entry of the positively charged ions reverses the polarity of the membrane inside the neuron.
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