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Circulatory Lev2

ribs Bones in your chest that protect your ribs and heart.
muscle A type of tissue that pulls or contracts to move you, or do jobs in the body. The heart is a pump that is made of this type of tissue.
veins Large blood vessels that carry blood IN toward the heart.
arteries Large blood vessels that carry blood Away from the heart.
capillaries Microscopic blood vessels with walls that are just one cell thick. They connect arteries and veins. Nutrients & oxygen diffuse in & out of the blood through the walls of these.
diffusion When molecules pass through a membrane, like into or out of a cell.
lungs 2 organs in the chest that inhale (breath in) oxygen and exhale (breath out) carbon dioxide.
cellular wastes Substances that cells no longer need, such as carbon dioxide, excess salt, urea, excess water, etc. Transported by the blood to be removed from the body.
hormones Chemical messages transported in the blood. Produced in special organs called glands.
hemoglobin Chemical in red blood cells that holds on to oxygen, to transport it.
plasma The liquid part of blood (mostly made up of water) that carries everything else in blood.
red blood cells Cells in blood that carry oxygen, with the help of hemoglobin.
white blood cells Cells in blood that fight disease by destroying and 'eating' bacteria, viruses, etc.
platelets Irregularly shaped blood cells that help blood to clot where there is a cut or injury. They stick together and dry up to form a scab.
small intestine Organ where all nutrients enter the blood, by diffusion into capillaries.
villi Microscopic finger-like structures in the small intestine, they contain capillaries for absorbing nutrients into the blood by diffusion.
tissues A group of similar cells working together, like muscle or skin.
organs Special structures in a body made up of tissues. Each has a specific job or jobs.
atom The smallest unit of matter.
molecule It is made of 2 or more atoms held together by bonds, like O2 or H2O
element Substance made of only one type of atom, like C or Mg or O2
compound Substance made of 2 (or more) different types of atoms like H2O or C6H12O6
bonds The attractions (forces) that hold atoms together to make molecules. They contain energy!
reactants The “ingredients” necessary for a chemical reaction. They “react” to form the products.
products What is created or produced after a chemical reaction.
Created by: rhk9