a soft fatty substance in the cavities of bones, in which blood cells are produced
tiny, thin-walled, grapelike clusters at the end of each bronchiole that are surrounded by capillaries; carbon dioxide and oxygen exchange takes place.
airway to which the vocal cords are attached.
System of all the bones in the body; forms an internal, living framework that provides shape and support, protects internal organs, moves bones, forms blood cells, and stores calcium and phosphorus compounds for later use.
two lower chambers of the heart, that contract at the same time, during a heartbeat.
tubelike passageway for food, liquid, and air.
muscle beneath the lungs that contracts and relaxes to move gases in and out of the body.
occurs when enzymes and other chemicals break down large food molecules into smaller ones.
of or relating to the process of digesting food.
voluntary, striated muscle that moves bones, works in pairs, and is attached to bones by tendons.
a structure, such as the heart, made up of different types of tissues that all work together.
process by which organisms exchange nutrient and waste gases
involuntary, nonstriated muscle that controls movement of internal organs.
fingerlike projections covering the wall of the small intestine that increase the surface area for food absorption.
A group of organs that work together to perform one or more functions.
muscle that cannot be consciously controlled.
two short tubes that branch off the lower end of the trachea and carry air into the lungs.
blood vessel that carries blood away from the heart, and has thick, elastic walls made of connective tissue and smooth muscle tissue.
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