Which of the options, A to D, correctly describes how an endotherm would respond to a decrease in environmental temperature?
vasoconstriction of arterioles near the surface of the skin
erector muscles relax, causing hairs to lie flat
sweat glands release more sweat
decrease in metabolic rate to minimize internal heat generation
19 exam-style questions on OCR A A Level Biology Communication and homeostasis. Each one has a worked solution and a mark scheme showing where the marks go.