1.2 levels of structural organization and body systems Flashcards
smallest units of matter that participate in chemical reactions
atoms
includes atoms and molecules
chemical level
two or more atoms joined together
molecules
molecules combined to form cells
cellular level
basic structural functional units of an organism that are composed of chemicals
smallest living units in human body
cells
cells in body
muscle fibers
nerve cells
epithelial cells
group of cells and materials surrounding them that work together to perform a particular function
tissues (tissue level)
covers surface, lines hollow organs and cavities, forms glands
epithelial tissue
connects, supports, protects body organs. while distributing blood vessels to other tissues
connective tissue
contracts to make body parts move and in the process generates heat
muscular tissue
carries information from one of the body to another through nerve impulses
nervous tissue
at this level, different types of tissues join together
organ level
structures composed of two or more different types of tissues
organs
types of organs
stomach
skin
bones
heart
liver
lungs
brain
contracts to churn and mix food and then push it into digestive organ, small intestine.
smooth muscle tissue
produces fluid and chemical responsible for digestion in stomach
epithelial tissue level
consist of related organs with common function
system level
breaks down and absorbs food
digestive system
all the parts of the human body functioning together constitutes the total organism.
organism level
