Week 2 Key Facts Flashcards
(23 cards)
What is homeostasis?
Maintaining a stable internal environment
Where are hormones made?
Endocrine glands
How are hormones transported to the target organs?
In the blood
What causes type 1 diabetes?
Lack of insulin made in the body
What causes type 2 diabetes?
Insulin resistance
Where do we extract most metals from?
Ores found in the earth’s crust
How are unreactive metals found in the earth’s crust?
Uncombined as pure metals
How are most ores found in the ground?
Metal Oxides
What is removed to extract an ore?
Oxygen
What is reduction?
The removal of oxygen
What is corrosion?
Rusting. Adding oxygen to a metal
What process amkes crude oil useful?
Fractional distillation
What is gas used for?
Heating and cooking
What is petrol used for?
Fuel in cars
What is kerosene used for?
Fuel in planes
What is diesel used for?
Fuel in cars and trains
What is bitumen used for?
Tar on the roads
Name a biofuel
Ethanol
How is ethanol made?
From sugar cane or sugar beet
Name an advantage of biofuesl
They reduce the demand for petrol
How do fuel cells make energy?
Combining oxygen and hydrogen to make water
What is ultrasound?
Sound with a frequency of greater than 20000 Hertz
What is infrasound?
Sound with a frequency of less than 20 hertz