Match each thermal condition or physiological response in pigs (1–4) with its correct behavioral or physiological description (A–D). Conditions / Responses: 1. Cold exposure 2. Heat exposure 3. Reduced peripheral blood flow 4. Increased skin blood flow Descriptions: A. Panting and increased respiratory rate to promote evaporative heat dissipation B. Shivering and huddling to generate and conserve body heat C. Elevated blood circulation near the body surface to transfer core heat to the environment D. Vasoconstriction in extremities to limit heat loss and maintain core body temperature

The pairs connect environmental conditions to the responses described in the source. Shivering, huddling, and bedding use help pigs cope with cold; reduced blood flow to extremities also helps limit heat loss. In warmer conditions, increased skin blood flow supports heat transfer to the environment, while panting and elevated respiratory rate are heat responses. **Key takeaway:** The direction of a response depends on whether the animal must conserve heat or dissipate it.\n\n**Glossary:**\n- **Peripheral blood flow**: Blood flow to body surfaces and extremities.\n- **Core heat**: Heat associated with the animal’s internal body.\n- **Heat transfer**: Movement of heat between an animal and its surroundings.