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Give examples of tissues
muscle tissue, nervous tissue
Give examples of organs
heart, stomach, brain
Give examples of organ systems
digestive system, nervous system
What does the digestive system do?
Breaks down and absorbs food
What are enzymes?
They are large molecules (proteins) which act as biological catalysts in living organisms
Why do enzymes usually only speed up one reaction?
the shape of the enzyme's active site only matches the reactants for one reaction
How would you test food to see if it contains sugars?
Using the Benedict's test. A + result will be yellow-orange
How would you test food to see if it contains starch?
The iodine test. A + result will be black-purple.
How would you test food to see if it contains protein?
Using the Biuret Reagent test. A + result will be a shade of purple.
What are the blood vessels that carry blood away from the heart called?
The aorta and the pulmonary artery
Why does the heart have valves?
to make sure blood flows in the right direction (stop it flowing backwards)
What does blood contain?
plasma with red blood cells, white blood cells and platelets in it
What do red blood cells do?
they carry oxygen
What do white blood cells do?
they help the body fight infection
Name six types of plant tissue
epidermal tissues, palisade mesophyll, spongy mesophyll, xylem, phloem , meristem tissue
How would you test food to see if it contains fats?
Using the Ethanol test. A + result will be cloudy.
What do root hair cells do?
they absorb water by osmosis, and mineral ions by active transport
What does phloem tissue do?
transports dissolved sugars from the leaves to the rest of the plant for immediate use or storage
What are the blood vessels that carry blood to the heart called?
The vena cava and the pulmonary vein