body function
what function does the mechanoreceptor affect
light=eyes
what is a series circuit.
series circuit are next to eachother
what are elemnts
a pure substance made up of only one atom
name some atomic models
billard ball,plum pudding,planetary,quantum
what is the effector
an organ or cell that reacts in response to stimuli
what is the abbreviated words for voltage,current and resistance
volts,amphs,omphs
describe the difference between solids,liquids and gases
solids= bunched up together really close
liquid= spread apart slightly
gas= spread really far apart
pros and cons of nuclear energy
pros- low cost,long lifetime,no pollution,benefits industry
cons-radiocative,accidents,slow reaction,affects marine
what is homeostasis
homeostasis is the state of steady safe internal,physical and chemical conditions maintained by the body
what is the law of concervation
energy can not be created nor destroyed. it can only be transformed
what charge are electrons and what do they do
they are negitavley charged electrons orbit the nucleus in layers know as shells
what are chemical bonds determined by
valency and outer shell electrons
what is in the first,second and third line for defence.
first=skin,mucus,membrane,tears,hair,saliva
second=fever,swelling,inflamation
third=antibodies,antigens,t and b cells
what elements have 2 shells with 4 electrons in its valance shell
carbon
what are the three types of radiation and what are they made up of
alpha-two protons,2 electrons and a positive charge due to the protons
beta-nuetrons turn into protons and electrons, electron is shot out as radiation
gamma-energy emitted by the nucleus shiffting,most penetrating