respiratory diseases caused by smoking cigarettes Why ANYTHING Can Cause Lung Cancer Cigarette smoke exposure and alveolar

Smoking is a leading cause of heart attacks and heart disease

air is funneled through the bronchi to the region where gas exchange occurs in the alveoli bronchiole: an airway that extends from the main bronchus to the alveolar sac capillary: the smallest blood vessel that allows the passage of individual blood cells and the site of diffusion of oxygen and nutrient exchange cardiac cycle: the filling and emptying the heart of blood caused by electrical signals that cause the heart muscles to contract and relax closed circulatory system: a system that has the blood separated from the bodily interstitial fluid and contained in blood vessels diaphragm: a skeletal muscle located under lungs that encloses the lungs in the thorax diastole: the relaxation phase of the cardiac cycle when the heart is relaxed and the ventricles are filling with blood electrocardiogram (ECG): a recording of the electrical impulses of the cardiac muscle inferior vena cava: the major vein of the body returning blood from the lower parts of the body to the right atrium larynx: the voice box, located within the throat nasal cavity: an opening of the respiratory system to the outside environment open circulatory system: a circulatory system that has the blood mixed with interstitial fluid in the body cavity and directly bathes the organs pharynx: the throat primary bronchus: (also, main bronchus) a region of the airway within the lung that attaches to the trachea and bifurcates to form the bronchioles pulmonary circulation: the flow of blood away from the heart through the lungs where oxygenation occurs and then back to the heart superior vena cava: the major vein of the body returning blood from the upper part of the body to the right atrium systemic circulation: the flow of blood away from the heart to the brain, liver, kidneys, stomach, and other organs, the limbs, and the muscles of the body, and then back to the heart systole: the contraction phase of cardiac cycle when the ventricles are pumping blood into the arteries trachea: the cartilaginous tube that transports air from the throat to the lungs tricuspid valve: a one-way opening between the atrium and the ventricle in the right side of the heart vein: a blood vessel that brings blood back to the heart ventricle: (of the heart) a large chamber of the heart that pumps blood into arteries

Animal Fun Fact African tigerfish have been known to leap out of the water to catch birds mid-flight

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