four types of tissue
muscle tissue-muscles
nerve tissue-brain
connective tissue-bone and fat
epithelial tissue-skin
structure
body plan
function
job
relationship between structure and function
certain structures only allow for certain functions
stages of human development in the uterus
zygote–>embryo–>fetus
Why do pupils constrict
there is a lot of light
why do pupils dilate
there is little light