QUESTION 5 TTX (Tetrodotoxin) is an ion channel antagonist that has been discuss

Question

QUESTION 5 TTX (Tetrodotoxin) is an ion channel antagonist that has been discussed in your text and in class. What is its mechanism of action? A. TTX binds to sodium channels, opening them and depolarizing the membrane. B. TTX binds to potassium channels and prevents them from opening. C.TTX binds to potassium channels, causing them to open D.TTX binds to sodium channels and prevents them from open.ng QUESTION 6 Which of the following is NOT an amino acid neurotransmitter? OA glutamate O B. GABA O C.Glycine 0 D. Dopamine QUESTION 7 Which of the following statements is TRUE? O A. Calcium is maintained at high concentrations inside the cell because it is an important signaling molecule. O B. Calcium is an ion, and not used as a signaling molecule. O C.Calcium is maintained at low concentrations inside the cell because it is an important signaling molecule. O D.The calcium concentrations inside and outside the cell are equal at the equilibrium potential.

Explanation / Answer

5. d) TTX is a blocker of sodium channels. They bind to the sodium channels inihibiting the action potentials of neurons. They block the passage of sodium ions.

6. d) Dopamine is not an amino acid neurotransmitter whereas, Rest of them such as glutamate, glycine and GABA are.

7. c) Calcium is important in cellular signaling, their concentration is low inside the cell. Once they enter the cytosol, signal transduction pathway is activated.

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