Which of the illnesses is not infectious, a cold, flu, poisoning, tetanus?
poisoning
Name three characteristics of light
It travels in a straight line, in all directions and faster than any other type of energy
What are the types of energy?
chemical, thermal, lumious, electrical, magnetic
What is the difference between a voluntary and involuntary action?
we can control voluntary actions but we cannot control involuntary actions
What are examples of energy sources?
sun, wind, water, heat from the earth, biomass
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
Give an example of a pure substance
student answer
True or False: The parts of a pure substance are the components
False. A pure substance is not made up of different components
Name 5 senses humans use to interact with their environment
sight, hearing, smell, touch, taste
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 attaches bones to bones?
ligaments
True or false: Muscles work in pairs to pull bones
true
Name two ways heat can be transferred
by contact and at a distance
An alloy is an example of a ____ mixture.
homogeneous
Density is the relationship between an object´s _____ and_____
mass, volume
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
The components of a ____ mixture can be seen with the naked eye or a microscope.
heterogeneous
_____ is everything that can produce a change in matter.
Energy
The nervous system is divided into two parts: the central nervous system and the ______ nervous system
peripheral
Which allows all light to travel through it, transparent, translucent or opaque material?
transparent material
Describe one characteristic of energy.
student answer
What do the chemical changes photosynthesis, digestion and fermentation have in common?
They occur within living beings.
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