Questions and Answers
Air enters through the _____ or mouth.
nose
Which steps occur after air travels down the trachea?
Which of the following describes Boyle's Law?
Which muscles, when contracted, would increase the volume of air in the thoracic cavity?
Signup and view all the answers
What is the pressure resulting from the natural tendency of the lungs to decrease their size?
Signup and view all the answers
During an allergic reaction, which would aid respiration?
Signup and view all the answers
If the transpulmonary pressure equals zero, what will happen to the lung?
Signup and view all the answers
Breathing moves air in and out of the _____.
Signup and view all the answers
Oxygen diffuses from _____ in the lungs into capillaries.
Signup and view all the answers
In the blood, oxygen is bound to which protein?
Signup and view all the answers
After blood becomes oxygenated, where does it go?
Signup and view all the answers
Hemoglobin is a protein that can bind _____ molecules of oxygen.
Signup and view all the answers
Study Notes
Respiratory System Overview
- Air enters the respiratory system via the nose or mouth.
- Progression of airflow: trachea → bronchi → bronchioles → alveoli, where gas exchange occurs.
Key Structures in the Respiratory System
- Nasal Cavity: Warms and filters inhaled air.
- Larynx: Voice box involved in sound production.
- Trachea: Windpipe that conducts air to the lungs.
- Lungs: Main organs of respiration, site of gas exchange.
- Bronchus: Major air passages branching from the trachea.
- Bronchiole: Smaller airways under bronchus that lead to alveoli.
- Diaphragm: Key muscle that aids in inhalation by contracting and creating negative pressure.
Inhalation and Exhalation
- Inhalation: Diaphragm contracts and moves downwards; external intercostal muscles aid in expanding the chest cavity, allowing air to enter.
- Exhalation: Diaphragm relaxes and moves upwards; internal intercostal muscles may contract to push air out.
Boyle's Law
- The principle states that the pressure of gas within the lungs is inversely proportional to lung volume; decreasing the volume increases pressure.
Lung and Thoracic Pressures
- Intrapleural Pressure: Results from the elastic tendency of the lungs to shrink and the thoracic wall's tendency to expand; maintains lung expansion.
- If transpulmonary pressure equals zero, lungs will collapse.
Gas Exchange Process
- Breathing facilitates the movement of air in and out of the lungs.
- Oxygen diffuses from alveoli into capillaries, binds to hemoglobin in red blood cells, and then transports to tissues.
- Carbon dioxide diffuses from tissues to blood, transported to lungs, and exhaled.
Carbon Dioxide Transport
- Carbon dioxide is produced in mitochondria, diffuses into capillaries, transported to lungs, and exits through the nose or mouth.
Oxygen Transport Mechanism
- Oxygen moves from alveoli into capillaries, enters red blood cells, binds to hemoglobin, and is delivered to body's tissues.
Inhalation Mechanism
- Inhalation is initiated by the contraction of the diaphragm and rib muscles, expanding thoracic cavity.
Oxygen Movement from Lungs to Blood
- The exchange of oxygen occurs at the alveoli, where oxygen moves into the capillaries.
Oxygen Binding
- Hemoglobin found in red blood cells binds up to four molecules of oxygen, facilitating efficient oxygen transport.
Post-Oxygenation Process
- Once blood is oxygenated in the lungs, it returns to the heart for distribution to body cells.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the essential components and functions of the respiratory system. Learn about key structures such as the trachea, lungs, and diaphragm, as well as the processes of inhalation and exhalation. Test your knowledge on how gas exchange occurs and the role of Boyle's Law in respiration.
