Construction Health and Safety Technician (CHST) Practice Test 2025 – All-in-One Study Guide for Exam Success!

Coughing and dizziness are key signs of potential injury from toxic substances because they indicate possible exposure to harmful materials that can irritate the respiratory system or affect the central nervous system. These symptoms can arise from inhaling toxic fumes or dust, which can lead to more serious health issues if exposure continues or if not addressed promptly. Respiratory distress, which is characterized by coughing, can be a body's immediate response to irritants or toxins, while dizziness may suggest neurological effects or a lack of proper oxygenation due to exposure.

In contrast, options such as total loss of vision, high blood pressure, and increased reflex reaction, while they may relate to other health conditions or exposures, are not typically immediate indicators of toxicity. A sudden loss of vision may be associated with severe trauma or certain specific toxic or medical conditions, but it is not a common early symptom of general toxic exposure. High blood pressure can be influenced by numerous factors unrelated to toxins, while increased reflex reaction does not signify toxicity and can occur in various physiological conditions unrelated to toxic exposure.