Cells
what does multicellular and unicellular mean
multi- uses many different cells
uni- made up of one cell
circulatory system
' highway system of the body'removes wast
what do veins do?
bring oxygen to heart
What is light?
energy we can see
light is a wave
electromagnetic radiation
convex lens
shaped like a football and used to correct people who cant see close
what is the cell membrane and what does it do?
the cell membrane is is an outside layer of a cell and keeps toxic stuff out
what part of the heart is the strongest
left ventrical
What do arteries do?
Take blood away from the heart.
what's a incandesent source
heating up something to a temp that is creates light
concave lens
a lens shaped like a hourglass and is used to correct people who cant see far
whats the mitochondria
the powerhouse of the cell
trachea
windpipe, connects lungs and mouth
what do red blood cells do?
carries oxygen
pros and cons of an fluoresent source
pros- more energy efficient ( wastes less heat)
cons- expensive, hard to get rid of, contains phosphorus and mercury
law of reflection
angle of reflection= the angle of incidence
what does the golgi apparatus do
prosseses and packages protein when they leave the cell
what does the stomach do?
breaks down food
what do white blood cells do?
Fight off things in our body
how fast can light travel
300,000 miles per sec
nearsighted people cant see what, and how can it be corrected?
nearsighted people cant see far and this can be corrected using a convex lens
whats the nucleus
the ' brain' of cell, and holds the DNA
what does a kidney do?
helps remove wast from our body with the use of urine
what does a platelet do?
act as a ' natural band-aid'
creats scabs
first principle of light
when light reaches a surface, it can be absorbed and transformed into other types of energy
farsighted people cant see what? and how can this be corrected?
farsighted people cant see close and this can be corrected with the use of a convex lens