Azygos system 3
Share your inquiries now with community members
Click Here
Sign up Now
Lessons List | 100
Lesson
Show More
Lessons
Comments
Our New Certified Courses Will Reach You in Our Telegram Channel
Join Our Telegram Channels to Get Best Free Courses
Join Now
We Appreciate Your Feedback
7 Reviews
Vasco Sar
HEMANT KUMAR MAURYA
Lydia
DIPESH KUMAR SINGH 2014843
Show More Reviews
Related Courses in Medical
Course Description
The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history. In land animals the respiratory surface is internalized as linings of the lungs. Gas exchange in the lungs occurs in millions of small air sacs; in mammals and reptiles these are called alveoli, and in birds they are known as atria. These microscopic air sacs have a very rich blood supply, thus bringing the air into close contact with the blood. These air sacs communicate with the external environment via a system of airways, or hollow tubes, of which the largest is the trachea, which branches in the middle of the chest into the two main bronchi. These enter the lungs where they branch into progressively narrower secondary and tertiary bronchi that branch into numerous smaller tubes, the bronchioles. In birds the bronchioles are termed parabronchi. It is the bronchioles, or parabronchi that generally open into the microscopic alveoli in mammals and atria in birds. Air has to be pumped from the environment into the alveoli or atria by the process of breathing which involves the muscles of respiration.
In most fish, and a number of other aquatic animals (both vertebrates and invertebrates) the respiratory system consists of gills, which are either partially or completely external organs, bathed in the watery environment. This water flows over the gills by a variety of active or passive means. Gas exchange takes place in the gills which consist of thin or very flat filaments and lammelae which expose a very large surface area of highly vascularized tissue to the water.
Other animals, such as insects, have respiratory systems with very simple anatomical features, and in amphibians even the skin plays a vital role in gas exchange. Plants also have respiratory systems but the directionality of gas exchange can be opposite to that in animals. The respiratory system in plants includes anatomical features such as stomata, that are found in various parts of the plant.
Trends
Learning English Speaking
MS Excel
UX design foundations for beginners
Accounting Finance course
Web Design for Beginners
Excel skills for busines intermediate
Python programming language
Python for data science and AI
DXC Technology Job recruitment
Creating bitmap images from scratch
Web development with Java spring
Graphic Design | Photoshop
Excel Accounting and Finance course
Logo Design
English greetings and responses
Organization and Architecture COA
Graphic design rules for beginners
Video editing with adobe premiere
Building arduino robots and devices
Web Design Using HTML CSS
Recent
Building arduino robots and devices
Thermodynamics fundamentals for engineers
Excel skills for busines intermediate
Machine learning by stanford university
Digital manufacturing and design principles
Machine learning foundations
Web development with Java spring
AI with IBM Watson
environmental law and policy principles
Creating a business marketing brand
Financial markets coursera quiz answer
CISCO cybersecurity exam questions
Resume and CV writing basics
Excel skills for business specialization
Digital media and marketing strategies
IBM cybersecurity analyst certificate
AWS identity and access management
Financial safety in cyberspace
DXC Technology Job recruitment
UX design foundations for beginners