you were outside on a very cold day and you have no coat, you are getting very cold. What will your body do to maintain homeostasis? What does this cause?

When the hypothalamus senses you're too cold it sends signals to your muscles that make you shiver to stay warm. It also controls your blood pressure to keep you warm.

you shiver as your blood veins shrink to maintain body heat

silty loam

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.