Respiratory System Navasota Junior High
Processes of the Respiratory System • Breathing is the movement of the chest that brings air into the lungs and removes waste gases • Oxygenating blood– oxygen is needed by all cells to release energy from glucose (cellular respiration) • Expelling carbon dioxide wastes - carbon dioxide and water are the waste products of cellular respiration.
The Respiratory System • Controlled by both the involuntary (autonomic) and voluntary (somatic) nervous system. • You breathe in and out anywhere from 15-25 times per minute. • How long can you hold your breath?
Function of the Respiratory System Exchange oxygen and carbon dioxide between the air and the blood in the lungs so that the exchange of oxygen and carbon dioxide can occur between the blood and the body cells.
How Breathing works • Air moves from HIGH to LOW pressure • Inhaling – Diaphragm contracts and the chest cavity expands making the air pressure lower so that air rushes in • Exhaling – Diaphragm relaxes and the chest cavity gets smaller making the air pressure higher so that air rushes out
What three body systems work very closely together to get oxygen to body cells and remove wastes from them as well?
Respiratory System Structures Nose/Nasal Cavity: Its size, location, mucous lining, & tiny hairs (cilia) inside help prevent foreign objects from entering. It warms & adds moisture to the air. Pharynx: Located in the back of the throat. Both food & air travel through it but not at the same time. Epiglottis – A flap of tissue at base of tongue that keeps food from going into the windpipe when swallowing Larynx – (voice box) – lies in front of throat where air passes through and causes the vocal cords to vibrate producing sound
More Respiratory Structures • Trachea – (wind pipe) Tube that connects the nose and mouth to the lungs located in front of neck with tough cartilage rings around it • Lungs – Two large organs made of spongy, elastic tissue that stretches and constricts as you breathe • Bronchial tubes – Two tubes that branch off of the trachea into the lungs • Alveoli – Tiny air sacs located at the ends of the bronchioles where gases are exchanged between the capillaries and each alveolus • Diaphragm – Large muscle that contracts and relaxes to cause inhaling and exhaling