Respiratory System

Respiratory System Overview

The respiratory system is responsible for the exchange of gases, primarily oxygen and carbon dioxide, between the body and the environment.

Main Function

To facilitate breathing, allowing for the intake of oxygen and the expulsion of carbon dioxide.

Primary Organs

1. Nasal cavity 2. Pharynx 3. Larynx 4. Trachea 5. Bronchi 6. Lungs.

Nasal Cavity

The chamber behind the nose where air is warmed, moistened, and filtered before entering the lungs.

Pharynx

The throat area that connects the nasal cavity and mouth to the esophagus and larynx.

Larynx

Also known as the voice box, contains the vocal cords and regulates airflow into the trachea.

Trachea

The airway that connects the larynx to the bronchi, also known as the windpipe.

Bronchi

Two main branches from the trachea that lead into each lung, dividing further into smaller bronchioles.

Bronchioles

Small air passages within the lungs that branch from the bronchi and lead to the alveoli.

Alveoli

Tiny air sacs at the end of bronchioles where gas exchange occurs.

Gas Exchange

The process by which oxygen is absorbed into the bloodstream and carbon dioxide is removed from it.

Mechanics of Breathing

Involves the diaphragm and intercostal muscles contracting to create negative pressure, pulling air into the lungs.

Inhalation

The process of drawing air into the lungs, primarily driven by diaphragm contraction.

Exhalation

The process of expelling air from the lungs, usually a passive action during quiet breathing.

Diaphragm

A dome-shaped muscle that separates the thoracic cavity from the abdominal cavity and plays a major role in respiration.

Intercostal Muscles

Muscles located between the ribs that assist with the expansion and contraction of the rib cage during breathing.

Pleura

Thin membranes that line the thoracic cavity and cover the lungs, reducing friction during breathing.

Lung Structure

Each lung is divided into lobes: the right lung has three lobes, and the left lung has two lobes.

Pulmonary Circulation

The pathway in which blood flows from the heart to the lungs and back, allowing for gas exchange.

Oxygen Transport

Hemoglobin in red blood cells binds to oxygen in the lungs and carries it to tissues throughout the body.

Carbon Dioxide Transport

Carbon dioxide is transported from tissues back to the lungs primarily as bicarbonate ions.

Respiratory Rate

The number of breaths taken per minute, typically ranging from 12 to 20 in resting adults.

Asthma

A chronic condition characterized by airway inflammation and constriction, leading to difficulty in breathing.

Chronic Obstructive Pulmonary Disease (COPD)

A progressive lung disease that makes it hard to breathe due to airway blockage.

Pneumonia

An infection that inflames the air sacs in one or both lungs, potentially filling them with fluid.

Lung Cancer

A type of cancer characterized by uncontrolled cell growth in lung tissues.

Sleep Apnea

A disorder characterized by repeated interruptions in breathing during sleep.

Respiratory Alkalosis

A condition that occurs when carbon dioxide levels drop too low, leading to increased blood pH.

Respiratory Acidosis

A condition where carbon dioxide levels build up, lowering blood pH.

Role of Carbon Dioxide

Plays a critical role in regulating blood pH and the respiratory drive.

Oxygen Therapy

A treatment involving the administration of oxygen to improve oxygen levels in the blood.

Pulmonary Function Tests

A series of tests used to measure how well the lungs are working.

Respiratory System Diseases

Include conditions like asthma, bronchitis, emphysema, and pneumonia, which impair respiratory function.