Our Respiratory System. Chapter 7 Created by Qiana Jones

1. Chapter 7 Our Respiratory §ystem

2. Respiratory §ystem:Oxygen Delivery System The primary function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing. When we breathe, we inhale oxygen and exhale carbon dioxide. This exchange of gases is the respiratory system's means of getting oxygen to the blood.

3. Process During Respiration Includes… Pulmonary ventilation-moving air into and out of the lungs. External Respiration-gas exchange between the lungs and the blood. Transport-transport of oxygen and carbon dioxide between the lungs and the tissue. Internal Respiration-gas exchange between systemic blood vessels and tissues.

4. Organs of the Respiratory §ystem

5. THE LUNG§ The main organs of the respiratory system. Cardiac notch (impression) cavity that accommodates the heart. In the lungs oxygen is taken into the body & carbon dioxide is breathed out. Protected by a double membrane called the pleura. The area between the right and left lung is the mediastinum & contains the heart, aorta, esophagus, thymus gland & trachea. The red blood cells are responsible for picking up oxygen in the lungs and carrying the oxygen to all the body cells that need it. The red blood cells drop off the oxygen to the body cells, then pick up the carbon dioxide which is the waste gas product produced by our cells. The red blood cells transport the carbon dioxide back to the lungs and we breathe it out when we exhale.

6. THE TRACHEA §ometimes called the “windpipe” Flexible & mobile tube extending from the larynx into the mediastinum. The trachea filters the air we breathe and branches into the bronchi. Composed of three layers: Mucosa-made up of goblet cells, ciliated epithelium and lamina propria Submucosa-connective tissue deep to the mucosa Adventitia-outermost layer made of connective tissue reinforced by C-Shape rings of hyaline cartilage

7. NASAL CAVITY Process where ventilation begins. Lies in and posterior to the external nose. Divided by a midline nasal septum. Opens posteriorly into the nasal pharynx via internal nares. Ciliated mucosal cells removes contaminated mucus. Inspired air is humidified by the high water content in the nasal cavity & warmed by rich plexuses of capillaries.

8. THE PHARYNX Also called the “throat”which is used by bothe the respiratory & digestive systems. Funnel shaped tube of skeletal muscle that connects to the: Nasal Cavity & mouth superiorly. Larynx & esophagus inferiorly. Extends from the base of the school to the level of the sixth cervical vertebra. Divided into three regions: 1. Nasopharynx 2. Oropharynx 3. Laryngopharynx

9. THE LARYNX Also called the “voicebox” A muscular structure located between the pharynx and the trachea. Contains the vocal cords. The walls of the larynx are composed of several cartilage plates held together with ligaments & muscles. One of these cartilages, the thyroid cartilage, forms what is known as the “Adam’s Apple.”

10. BRONCHIAL TUBES Connected to the two lungs. They bring air to the alveoli for storage in the lungs. The distal end of the trachea divides to form the left & right primary (main) bronchi. Each bronchus enters one of the lungs & branches repeatedly to form second & tertiary bronchi.

11. In Conclusion: ALWAYS REMEMBER RE§PIRATION = BREATHING