biology exam Flashcards
(25 cards)
how was Darwin’s theory of natural selection different from the theories of evolution that others had at the time
Darwin believed animals with good traits gave birth to more offspring and other believed traits were just passed down
what is natural selection
organisms with good characteristics for the environment that reproduce more
what was lamaracks theory
giraffes could stretch their necks and pass on their traits
what are adaptions
characteristics that enhance survival
what is convergent evolution
similar bodies but no common ansectors
5 agents of evolutionary change
mutation, gene flow, natural selection, non-random mating, and genetic drift
what are the 4 types of tissue
epithelial, connective, nervous, muscle
what are the connective tissue
bone and blood
what is the function of the epithelial tissue
protection, absorption, secretion, filtration
what are the three types of muscle tissue
skeletal, cardiac, smooth
what do nervous tissue do
senseing and interpreting changes
what is homeostais
constant internal condition in body
what is negative feedback
function to return body condition to set point
what is positive feedback
makes deviations larger
what’s respiration
uptake of oxegen and discharge of cardon dioxide
what 4 stages of digestion
ingestion, digestion, absorption, elemination
what is the esophogas
tube leading from the mouth to stomach
what is a gastric ucler
stomach wall fails to protect itself from erosion of gastric juice
what does the gallbladder do
stores bile
what does the stomach do
releases digestive enzymes and acids
what does the small intestine do
absorbs nutrients
what does the large intestine do
extracts water from indigestible foods
what does the liver do
produces bile
what does the pancreas do
produces insulin
