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Unit 2B

Circulatory & Respiratory Systems

TermDefinition
Heart The primary organ of the circulatory system
Artery Carries oxygen and nutrients away from the heart to the body
Vein Carries carbon dioxide and waste towards the heart
Capillaries Very tiny blood vessels connecting arteries and veins
Valve Control the flow of blood through the heart by opening and closing during contractions
Oxygen Gas that the body needs to survive
Carbon Dioxide Gas that the body gives off as a waste
Aorta The main artery of the heart carrying oxygenated blood to all parts of the body except the lungs
Vena Cava Large vein carrying deoxygenated blood back to the heart
Lungs Primary organ of the Respiratory System that takes in oxygen and gives off carbon dioxide.
Larynx Hollow muscular organ which holds the vocal chords (Voice box) which produces sound
Trachea A hollow tube (wind pipe) that connects the larynx to the right and left of the bronchus
Bronchioles The smallest air passageways coming off of the bronchi
Alveoli The air sacks at the end of the bronchioles where the gas exchange takes place (oxygen in and carbon dioxide out)
Diaphragm A sheet of internal skeletal muscle that extends across the bottom of the thoracic cavity (heart/lungs) that pulls and pushes against the lungs as we inhale and exhale
Respiration a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances
Nasal and Oral Cavities Where the respiratory system begins and air is moistened, warmed, and filtered as it enters the body.
Bronchus The two major air passageways leading from the trachea to the lungs
Epiglottis A flap of elastic cartilage attached to the larynx that closes when food passes by
Pharynx (Throat) The passage that leads from the cavities of the nose and mouth to the larynx
Created by: PRO Teacher dowdyp