OBJECTIVES explain how your body uses the air you breath. identify the parts and functions of the respiratory system. describe ways to maintain the health of your respiratory system. analyze the role of posture in respiratory health
BREATHING Breathing is a function of your respiratory system. respiratory system A system that consists of organs that supply the body with constant oxygen and rid the body of carbon dioxide A person can only live a few minutes without oxygen.
FUNCTIONS There are two types of respiration. respiration The exchange of gases between your body and the air
EXTERNAL RESPIRATION The exchange of oxygen and carbon dioxide between the blood and the air in the lungs.
INTERNAL RESPIRATION The exchange of gases between the blood and the cells of the body.
PARTS OF THE RESPIRATORY SYSTEM Each lung is divided into sections called lobes. From the bronchi, air moves into smaller tubes called bronchioles. bronchi The main openings through which air enters the lungs
PARTS OF THE RESPIRATORY SYSTEM Bronchioles are divided into smaller spaces called alveoli. alveoli Tiny air sacs in the lungs where carbon monoxide is exchanged with oxygen
PARTS OF THE RESPIRATORY SYSTEM Lungs get their power from the diaphragm. diaphragm A dome-shaped muscle that separates the chest from the abdomen
DIAPHRAGM WHEN YOU INHALE… The diaphragm contracts and flattens, permitting the lungs to expand and fill with air. WHEN YOU EXHALE… The diaphragm expands and moves upward, squeezing the lungs and forcing air out.
PROBLEMS Asthma is the most common respiratory disease suffered by young people. asthma A serious, chronic condition that causes tiny air passages in the respiratory system to become narrow or blocked Asthma attacks are often triggered by an allergic reaction to substances in the environment.
CARE Knowing your area’s Air Quality Index (AQI) can help you maintain your respiratory health. Air Quality Index (AQI) A measure of ozone, sulfur dioxide, carbon monoxide, and fine particles close to the ground On days when air quality is poor, avoid outdoor activities.
CARE EXERCISE MAKES LUNGS STRONGER AVOIDING TOBACCO KEEPS LUNGS HEALTHY PROTECT YOURSELF FROM RESPIRATORY INFECTIONS