Which statement best contrasts local and systemic effects?

Which statement best contrasts local and systemic effects?

• A. Local effects affect the entire body; systemic effects affect only the entry site
• B. Local effects occur at the entry point; systemic effects occur at the entry point as well
• C. Local effects are restricted to the contact area; systemic effects are distributed through the body
• D. Local effects are unrelated to exposure; systemic effects are

Answer: (C)

Local effects show up at the site of contact and are limited to the area that touched the substance. Systemic effects arise after the substance is absorbed into the body and circulated through the bloodstream or lymphatic system, potentially affecting organs and tissues far from the entry point. So, the statement that best contrasts them is that local effects are restricted to the contact area while systemic effects are distributed through the body. The other choices misstate where effects occur—whether at the entry point, across the whole body, or in relation to exposure—so they don’t fit the real distinction.

Local effects show up at the site of contact and are limited to the area that touched the substance. Systemic effects arise after the substance is absorbed into the body and circulated through the bloodstream or lymphatic system, potentially affecting organs and tissues far from the entry point. So, the statement that best contrasts them is that local effects are restricted to the contact area while systemic effects are distributed through the body. The other choices misstate where effects occur—whether at the entry point, across the whole body, or in relation to exposure—so they don’t fit the real distinction.