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Natural Science Review Units 5-8

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  • True or False: The parts of a pure substance are the components
    False. A pure substance is not made up of different components
  • Which of the illnesses is not infectious, a cold, flu, poisoning, tetanus?
    poisoning
  • Give an example of a pure substance
    student answer
  • True or false: Muscles work in pairs to pull bones
    true
  • 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
  • What attaches bones to bones?
    ligaments
  • 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
  • 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
  • What is the difference between a voluntary and involuntary action?
    we can control voluntary actions but we cannot control involuntary actions
  • _____ is everything that can produce a change in matter.
    Energy
  • What are nerve cells called?
    neurons
  • An alloy is an example of a ____ mixture.
    homogeneous
  • Name two ways heat can be transferred
    by contact and at a distance
  • What do the chemical changes photosynthesis, digestion and fermentation have in common?
    They occur within living beings.
  • The nervous system is divided into two parts: the central nervous system and the ______ nervous system
    peripheral
  • Name 5 senses humans use to interact with their environment
    sight, hearing, smell, touch, taste
  • What are the parts of the central nervous system?
    brain, crebellum, brainstem, skull, meninges, crebrospinal fluid
  • The components of a ____ mixture can be seen with the naked eye or a microscope.
    heterogeneous
  • 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 one characteristic of energy.
    student answer
  • Density is the relationship between an object´s _____ and_____
    mass, volume
  • What do infectious agents do?
    They enter the body and cause illnesses
  • Name three characteristics of light
    It travels in a straight line, in all directions and faster than any other type of energy
  • 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
  • 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.
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