Question

alejandra has started to use heroin. how will this most likely affect her body systems? (1 point) it will fill the lungs with toxic material. it will release serotonin and dopamine to the brain. it will block the transmission of pain signals to her brain. it will speed up the central nervous system.

Explanation:

Heroin is an opioid. Opioids work by binding to opioid - receptors in the brain and other parts of the body, and they are known to block the transmission of pain signals to the brain. While it can have effects on neurotransmitters like dopamine, the most characteristic effect among the options given is pain - signal blocking. It does not fill lungs with toxic material in the typical sense, and it depresses rather than speeds up the central nervous system.

Answer:

It will block the transmission of pain signals to her brain.