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B4 Homeostasis 2

OCR 21st Century Science

QuestionAnswer
Why is it important to balance energy loss and energy gain? So your body temperature remains constant.
Are your bodies extremities cooler or warmer than your core body temperature? Cooler.
In your body, what part acts as the receptors? Temperature receptors in the skin (to measure external heat) or receptors in the brain (to measure the temperature of the blood.)
In your body, what acts as the processing centre? Your brain.
In your body, what acts as the effectors? Sweat glands and muscles.
What happens when your body temperature is too high? You sweat because evaporation requires heat energy from the body.
What happens when your body temperature is too low? Your body will shiver. This is rapid muscle contractions and require energy from increased respiration so the heat warms the surrounding tissue.
What part of the brain controls your blood temperature? Hypothalamus.
What is vasodilation? When blood vessels in the skin dilates, allowing more flood to flow through the skin capillaries so more heat can be lost on the surface of the skin by radiation.
What is vasoconstriction? When blood vessels in the skin constrict, reducing the amount of blood that flows through the skin capillaries. This means less heat is lost from the skin by radiation.
What is a heat stroke? Uncontrolled increase in body temperature.
How does heat stroke occur? Increased sweating can result in dehydration. If someone if dehydrated they will be unable to sweat so their core body temperature will increase even further.
What are some causes of heat stroke? Exercising in warm conditions, very high humidity and dehydration.
What are symptons of heat stroke? Confusion, red or dry skin, low blood pressure, convulsions, fainting or a rapid heartbeat.
How can you treat heat stroke? Removing clothes, bathing in cool water, using a pan, putting ice packs on the neck, head and groin, and elevating the legs.
What is hypothermia? When your core body temperature drops under 35 degrees.
How does hypothermia occur? When your body is exposed to low temperatures for a long period of time and your body can't replace heat as fast as it's being lost.
What are some symptoms oh hypothermia? Grey skin colour, amnesia, shivering, slurred speech, confusion, loss of coordination and cold skin.
How can you treat hypothermia? Raising the core body temperature, insulating the body (armpits, head and groin), and drinking warm drinks (not alcohol).
What shouldn't you do when someone has hypothermia? Rub the skin - this will bring blood to the surface and even more heat will be lost.
Created by: charlotteisgod
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