Ligand-gated ion channels are ; g protein-coupled receptors are a. slow/ionotropic; fast/metabotropic b. fast/ionotropic; slow/metabotropic c. slow/metabotropic; fast/ionotropic d. fast/metabotropic; slow/ionotropic

The answer is b. fast / ionotropic; slow / metabotropic. There is fast neurotransmission since the ligand – gated ion channel receptor is directly activated by the neurotransmitter.  On the other hand, G – protein coupled receptor is bound to the neurotransmitter in order to stimulate a chemical signaling cascade which has a longer pathway, thus, making it slow and metabotropic.

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies