**Question:** Fluoride is carried in the blood via:

A. Glucose transporters
B. Amino acid transporters
C. Chloride channels
D. Lactate transporters

**Core Concept:** Fluoride ions, essential for dental health, are transported through the bloodstream. They are primarily taken up by cells via specific transporters.

**Why the Correct Answer is Right:**
Fluoride ions are primarily transported in the blood via sodium-dependent phosphate transporters, specifically the sodium-dependent phosphate co-transporter 2 (NaPi2). These transporters are involved in the active transport of phosphate ions across cell membranes, and they also facilitate the uptake of fluoride ions. The correct answer, D (lactate transporters), is not involved in fluoride transport due to its specificity for lactate.

**Why Each Wrong Option is Incorrect:**
A (glucose transporters) are responsible for the passive transport of glucose, not fluoride ions. B (amino acid transporters) are involved in the transport of amino acids, not fluoride. C (chloride channels) are primarily responsible for the movement of chloride ions across cell membranes, not fluoride ions.

**Clinical Pearl:** Understanding fluoride transport is crucial for maintaining dental health, as fluoride helps prevent tooth decay. Fluoride concentration in drinking water and toothpaste plays a significant role in dental health outcomes in a population.

**Correct Answer:** D (Lactate transporters)

Fluoride ions are transported into cells using sodium-dependent phosphate transporters (NaPi2), which are specific for both phosphate and fluoride ions, ensuring proper dental health.