16. What antibodies are found in a person with blood type A? (A) Anti-A antibodies (B) Anti-B antibodies (C) Anti-A and Anti-B antibodies (D) No antibodies (E) All of above

25. 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 (E) By blocking voltage-gated Ca²⁺ channels

16. What antibodies are found in a person with blood type A?
(A) Anti-A antibodies
(B) Anti-B antibodies
(C) Anti-A and Anti-B antibodies
(D) No antibodies
(E) All of above

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