Both excitatory and inhibitory neurons form junctions with muscles. By what mechanism do inhibitory neurotransmitters prevent the postsynaptic cell from firing an action potential?
(a) by closing Na+ channels
(b) by preventing the secretion of excitatory neurotransmitters
(c) by opening K+ channels
(d) by opening Cl– channels
(d) Inhibitory neurons release inhibitory neurotransmitters such as GABA and glycine. They bind to and open ligand-gated Cl– channels. If Na+ channels are open, Cl– ions will rush into the cell as well, neutralizing the positive charges carried by Na+.
You might also like to view...
Which of the following adhesive molecules can be found in all complex multicellular
A. None of these options is correct. B. cadherins C. integrins D. pectins E. cadherins and integrins
Bone marrow is part of the lymphatic system
Indicate whether the statement is true or false
Chancroid
A. presents with a hard chancre. B. is caused by Haemophilus ducreyi. C. is very painful in both sexes. D. is caused by a spirochete.
Identify the correct order of structures in the vertebrate eye through which incoming light passes
before the impulse travels to the brain. 1) aqueous fluid 2) cornea 3) lens 4) optic nerve 5) rods and/or cones 6) vitreous body a. 3 ? 6 ? 2 ? 1 ? 5 ? 4 b. 1 ? 3 ? 2 ? 6 ? 4 ? 5 c. 2 ? 6 ? 3 ? 1 ? 4 ? 5 d. 2 ? 1 ? 3 ? 6 ? 5 ? 4 e. 3 ? 5 ? 1 ? 6 ? 2 ? 4