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Natural Science Review Units 5-8
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Which allows all light to travel through it, transparent, translucent or opaque material?
transparent material
Name one natural and one man made source of light
a star or lightning, a light bulb or torch
Name three characteristics of light
It travels in a straight line, in all directions and faster than any other type of energy
Name two ways heat can be transferred
by contact and at a distance
What are examples of energy sources?
sun, wind, water, heat from the earth, biomass
What are the types of energy?
chemical, thermal, lumious, electrical, magnetic
Describe one characteristic of energy.
student answer
_____ is everything that can produce a change in matter.
Energy
What do the chemical changes photosynthesis, digestion and fermentation have in common?
They occur within living beings.
An alloy is an example of a ____ mixture.
homogeneous
The components of a ____ mixture can be seen with the naked eye or a microscope.
heterogeneous
True or False: The parts of a pure substance are the components
False. A pure substance is not made up of different components
Give an example of a pure substance
student answer
Density is the relationship between an object´s _____ and_____
mass, volume
Explain the difference between mass and volume
mass is a measure of the quantity of matter in an object, measured in gr and kg. Volume is the amount of space an object occupies measured in cubic meters & cm
Describe the function of the skull and the spinal cord
the skull protects the encephalon. The spinal cord transports information between the receptors, the encephalon and the effectors.
What are the parts of the central nervous system?
brain, crebellum, brainstem, skull, meninges, crebrospinal fluid
What are nerve cells called?
neurons
Receptor cells detect___. They send information to the ___ where the brain is located through the ___ system. Orders are generated and sent to ____
stimuli, encephalon, nervous, effectors
Name 5 senses humans use to interact with their environment
sight, hearing, smell, touch, taste
Which of the illnesses is not infectious, a cold, flu, poisoning, tetanus?
poisoning
What do infectious agents do?
They enter the body and cause illnesses
True or false: Muscles work in pairs to pull bones
true
What attaches bones to bones?
ligaments
What is the difference between a voluntary and involuntary action?
we can control voluntary actions but we cannot control involuntary actions
The nervous system is divided into two parts: the central nervous system and the ______ nervous system
peripheral
What is the function of the nervous system?
it allows us to interact with our environment by sensing changes, generating orders and reacting to them. The brain forms a part of the nervous system
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