February 24 Lecture - The Respiratory System The process of gaseous exchange within the body Respiration has two phases o External respiration The

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: February 24, 2009 The Respiratory System- The process of gaseous exchange within the body- Respiration has two phases: o External respiration The exchange of gases between the blood within the pulmonary capillaries and the air spaces that exist within the lung o Internal respiration The exchange of gases between the blood and the metabolic tissue (nervous, hepatic, muscle etc.)- Respiratory system is located above the respiratory diaphragm- Embryologically, the respiratory system begins as out growths from the primitive gut system o Makes appearance early into gestation (at about 4 weeks) o From the outgrowths, the entire bronchial tree will develop o Derived from the primitive germ layer known as the endoderm Same tissue as the anterior lobe of the pituitary and primitive gut- Respiratory system is different to a variety of other bodily systems (brain, heart, etc.) o Respiratory system does not become functional until the moment of birth (not until the fetus takes its first breath of air) o The respiratory system will begin to function as the fetal circulatory changes at birth (foramena and ducts close to allow pulmonary circulation to take place) Structures of the Respiratory System- Nose and nasal cavities- Nasal cavities lead to the pharynx- From the pharynx , at the lower back portion of the oral cavity is the larynx- Larynx leads directly to the trachea- Trachea divides into two bronchi- At the end of the branchial tree, the bronchioles are present- Bronchioles will then lead to the secular structures known as alveoli The Nose- The natural pathway for air entering and leaving the respiratory system o Not the only route, the mouth may be used if more air is needed- It is in the nose and nasal cavity that the air is filtered o The air is filtered by short stiff hairs known as vibrissae o Vibrissae project from the inner surface of the nose and the roof of the nasal cavity o Vibrissae functions Important in filtering out dust particles, bacteria, or any other debris located in the atmosphere which is inhaled- Lining of nasal cavity is made up of pseudostratified cilliated columnar epithelium...
View Full Document

This note was uploaded on 10/23/2011 for the course BIOL 2125 taught by Professor Dr.park during the Winter '02 term at A.T. Still University.

Page1 / 7

February 24 Lecture - The Respiratory System The process of gaseous exchange within the body Respiration has two phases o External respiration The

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online