What is the importance of trachea, bronchiole, lungs and respiratory muscles in human respiratory system?
Answers
Lungs are situated in air tight thoracic chamber. These are covered by double layered pleura with pleural fluid between them. It reduces friction on lung surface.
Trachea is lined with mucus secreting ciliated pseudostratified columnar epithelium. Mucus traps dust particles and bacteria present in inhaled air. Cilia beat upwards and push mucus laden with dust particles and germs out of trachea.
Trachea has 16 – 20 dorsally incomplete rings of hyaline connective tissue.
All bronchi are lined by ciliated and mucus secreting pseudostratified epithelium and are supported by hyaline rings.
Bronchioles have smooth muscles to regulate air flow.
During exercise sympathetic Nervous system stimulates adrenal medulla to release epinephrine (adrenaline) and norepinephrine (noradrenaline). These hormones relax smooth muscles in bronchioles thus dilate airways.
Alveoli form respiratory exchange part of respiratory system. Thus actual diffusion of O2 and CO2 between blood and atmospheric air occurs in alveoli.
Visit our website for purchasing XI & XII Complete Syllabus Video Lectures
https://concept-tutorials.teachable.com
