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Science 8 Unit 1,2

Science 8

nucleus controls all the cell's activities
cell membrane holds cell in place
cytoplasm controls what enters and leaves
vacuole stores material like wastes
mitochondria produce energy
cell wall protects and supports the plant cell
chloroplast traps light energy
Diffusion movement of the amount of a substance from an area of higher concentration to a area of lower concentration(temperature may change the speed)
Osmosis is the diffusion of water
respiratory system controls breathing
skeletal system has bones that support the body and work with muscle to move the body
nervous system has nerves that detect, signal, and respond to changes in the enviroment
excretory system to remove liquid and gas waste
endocrine system makes hormones
digestive system takes in and break down food, absorbs nutrients and get rid of solid waste
integumentary system protects the body and includes skin, hair and nails
reproductive system include organs to produce offspring
immune system defends the body against infection
muscular system has muscles that work with bones to move the body
circulatory system moves blood, gases, nutrients and wastes
carbohydrates is the fastest source of energy (bread, rice)
proteins helps build muscles, skin, nails and hair (fish and nuts are some examples)
fat use to build cell membrane and can be save in body as energy
Innate immune response quick, general and non specific. WHich means it responses when the body recognize the invader. Examples are, inflammation and phagocytes (white blood cells)
Acquired immune response The phagocytes send a signal to helper T cell to find the specific B cell to defeat this invader. B cell launches antibody to provide antigen to spread. If it doesn't kill them, your body finally activates killer T cells, which destroy everything.
Antibodies Made by B cells to stick on the antigens, providing them to spread.
Antigen Unrecognized pathogens
Pathogen Invaders of our body
Allergen Causes allergy
Law of reflection The angle of incidence is the same as the angle of reflection
Order of the electromagnetic spectrum Radio->micro->infrared->visible->UV->X-ray->Gamma
Visible spectrum ROYGBIV
Primary colors Red, yellow, blue
Refraction Bending of light
Crest Top of a wave
Trough Bottom of a wave
Wavelength Distance from crest to crest, trough and trough ,and wave to wave
Amplitude Height of wave
Rest position A flat line to indicate the curves of the wave
Compression wave Force moves back and forth
Transverse wave Forces moves up and down
Translucent Around half of the light will go through
Transparent All the light could go through
Opaque No light can go through
Pupil the black circle in your eye
Iris the colored ring around your eye
Sclera The white part of your eye
Cornea Refracts the light to hit the back your eye
Retina Back of your eye
Lens Fine tune the image seen by your light
Optic nerve receive the image from your eyes
Blind spot where the optic nerve is connected to the retina
Rod cells Cells that provide us the ability to see shades of grey
Cone cells Cells that provide us the ability to see colors
Created by: lwong