The Respiratory System

The process in which oxygen and glucose undergo a complex series of chemical reactions inside cells is called… RESPIRATION

The Respiratory System Functions? Moves oxygen from the outside environment into the body Removes carbon dioxide and water from the body

The Respiratory System Taking in Oxygen Oxygen is needed for energy releasing chemical reactions that take place within the cells Like fire which cannot burn without oxygen your cells cannot burn enough fuel to keep you alive without oxygen

The Respiratory System During respiration, cells break down simple food molecules such as sugar and release the energy they contain. RESPIRATION

The Respiratory System Respiration is different from breathing Breathing is the movement of air into and out of the lungs

The Respiratory System Respiration refers to chemical reactions inside cells Respiration produces Energy Carbon Dioxide Water

The Respiratory System Eliminates the carbon dioxide and some of the water through the lungs

The Respiratory System Oxygen from the air and glucose from digested food are both carried to the cells by the blood

The Respiratory System During respiration, oxygen reacts with glucose to release energy

The Respiratory System Respiration could not take place without the Circulatory and Digestive systems

The Respiratory System As air travels from the outside environment to the lungs, it passes through the

The Respiratory System Air enters the body through the nose and moves into the nasal cavities

The Respiratory System Then the air enters the pharynx The pharynx is the only part of the respiratory system that is shared with another system The digestive system Both the nose and mouth connect to the pharynx

The Respiratory System From the pharynx, air moves into the trachea, or windpipe The cilia in the trachea sweep upward, moving mucus toward the pharynx, where it is swallowed

The Respiratory System Air moves from the trachea to the bronchi, the passages that direct air to the lungs

The Respiratory System The lungs are the main organs of the respiratory system

The Respiratory System After air enters an alveolus, oxygen passes through the wall of the alveolus and then through the capillary wall into the blood. Carbon dioxide and water pass from the blood into the alveoli. Gas Exchange

Air moves from the trachea into the bronchi, the passages that direct air into the lungs. Inside the lungs, each bronchus divides into smaller and smaller tubes. The alveoli are found at the end of the smallest tubes. Gas Exchange in the Alveoli

When air enters an alveolus, oxygen passes through the thin wall of the alveolus and then through the wall of a surrounding capillary into the blood. At the same time, carbon dioxide passes from the blood into the alveolus. Gas Exchange in the Alveoli