Hang on to your seats as we go on a wondrous adventure through the human body. We are going to start at the right femoral vein and continue on our journey until we exit through the nose. Hope everyone is ready for this fun filled adventure to learn what is located in the body where we are going to journey through. So here we go we start by entering the path of the right femoral vein up to the external iliac then on to the common iliac. Then on into the lung and here are the structures we see in the lung are as follows: Right inferior lobe oblique fissure, right middle lobe, horizontal fissure, right superior lobe, and the right primary bronchus. Just a few fun facts about the lung! The lungs are fairly large organs. The narrow, superior position of each lung, up under the collarbone, is the apex; the board, inferior portion resting on the diaphragm is the base.
The trachea is an airway that branches to form an inverted tree of bronchi and bronchioles. Note that the right lung has three lobes and the left lung has two lobes. The lungs perform two functions air distribution and gas exchange. Each lung is divided into lobes by fissures. The left lung is partially divided into two lobes (superior and inferior) and the right lung into three lobes (superior, middle, and inferior). It is kind of interesting to know that the right lung is a little different from the left lung, some facts that are new to me. Now to explain how the body combats the invading bacterium in the body, first of all the white blood cells attack anything foreign to the body.
Next the white blood cells; surround the invader then attacks it at rapid speed trying to kill the bacteria that is in the body. The body best heals itself when it is asleep. The non-specific immunity is the white blood cells are innate immunity and adaptive immunity. Wow! this is some amazing things we are learning about this part of the body and how it fights of bacterium to keep the body healthy. Here are a few more facts about the immunity of the body. Innate immunity is where it is in place before a person is exposed to a particular harmful particle or condition. The word innate refers to something that is present naturally at birth. It includes mechanisms that resist a wide variety of threating agents or conditions. We are so lucky that we have this immunity’s in our body to fight of infection.
Adaptive immunity involves mechanisms that recognize specific threating agents and then adapt or respond by targeting their activity against these agents’ only specific harmful particles. Adaptive immune mechanisms often take some time to recognize their targets and react with sufficient force to overcome the threat on their first exposure to a specific kind of threating agent. Because innate mechanisms are already in place they have the advantage of being able to meet any enemy as soon as it presents itself.
Now that I have finished with the battle of the lung we will take a route across the alveolar membrane. The alveoli are the primary gas exchange structures of the respiratory tract. Alveoli are very effective in the exchange of carbon dioxide and oxygen because each alveolus is extremely thin walled, each alveolus lies contract with blood capillaries, and there are millions of alveoli in each lung. The barrier across which gases are exchanged between alveolar air and blood is called the respiratory membrane.
The respiratory membrane consists of the alveolar epithelium, the capillary endothelium, and their joined basement membranes. The bronchioles subdivide into smaller and smaller tubes, eventually terminating in microscopic branches that divide into alveolar ducts, which terminate in several alveolar sacs, the walls of which consist of numerous alveoli. The structure of an alveolar duct with its branching alveolar sacs can be likened to a bunch of grapes the stem represents the alveolar duct, each cluster of grapes represents an alveolar sac, and each grape represents an alveolus. Who knew that we had clusters of grapes in our lungs!
Now that we have learned about the alveolar membrane and its functions lets finish our voyage by looking at the rest of the parts of the body we are going to go through before we exit. Next we will be exploring the primary bronchus is located inside the lung at the right base of the trachea. After that it is on to the trachea which is a nearly cylindric tube in the neck, composed of C-shaped cartilage and membrane trachealis muscle, that extends from the larynx at the level of the sixth cervical vertebra to the fifth thoracic vertebra, where it divides into two bunches.
The trachea conveys air to the lungs. Next the larynx the organ of the voice that is part of the upper air passage connecting the pharynx with the trachea. It accounts for a large bump in the neck called the Adam’s apple and is larger in men than in women, although it remains the same size in men and women until puberty. The larynx forms the caudal portion of the anterior wall of the pharynx and is lined with mucous membrane that is continuous with that of the pharynx and trachea.
Moving on to the pharynx also known as the throat, a tubular structure about 13 cm long that extends from the base of the skull to the esophagus and is situated immediately in front of the cervical vertebrae. The pharynx serves as a passageway for the respiratory and digestive tracts and changes shape to allow the formation of different vowel sounds. Now we are about to the end of our journey Hope all of you enjoyed this fantastic journey with me through the human body and now we are ready to exit out through the nasal cavity also known as the nose so here we go hang on everyone it is going to be a bumpy ride! Thank you all for taking the time to listen to me on this fantastic voyage hope you enjoyed the ride.
Thibodeau, G., Patton, K. (2008). Structure and Function of the Body (13th Ed.). St. Louis, MO Thibodeau, G., Patton, K. (2007). Anatomy and Physiology (6th Ed.). St. Louis, MO