4.1 The homeostatic process represented in the diagram is thermoregulation (or temperature regulation).

Here are the answers to your questions:

1.4.1 The homeostatic process represented in the diagram is thermoregulation (or temperature regulation).

1.4.2

• a) DIAGRAM 1: Vasoconstriction
• b) DIAGRAM 2: Vasodilation

1.4.3

• a) Controls the homeostatic process represented in the diagrams: B - Hypothalamus
• b) Is less active on a very cold day: E - Sweat gland

1.4.4 The process taking place in DIAGRAM 4 (inactive sweat gland) is important because it prevents heat loss through evaporation of sweat, which helps to conserve body heat and maintain a stable internal body temperature when it is cold.