APK 2105C Lecture Notes - Lecture 38: Functional Residual Capacity, Costal Cartilage, Simple Squamous Epithelium

12 views2 pages
Chapter 16, Lecture 2
Pulmonary Ventilation
Anatomy of thoracic cavity
o Air-tight cavity
Pressure outside body is totally different
Allows for lungs to do their thing
o Bottom barrier = diaphragm
Floor of TC
o CT and ribs = roof of TC
o Ribs and costal cartilage = walls of TC
Hyaline
Costal cartilage attach ribs to sternum
o Muscle in between ribs and covering posterior walls of TC
Intercostals muscles between ribs
The pleura
o Each pleura surrounds a long
o Double layered membrane of simple squamous epithelium
Space in between the layers = pleural cavity
Serous fluid fills the cavity
o Totally separate from pericardium
o Functions
Lubrication between moving organs
Compartmentalization of thoracic cavity
Keeps infects localized
Intrapleural pressure keeps the lungs partially expanded at all times
Muscles of respiration
o Skeletal muscles
We have control
Have some involuntary control tooreflexes
o Muscles of inspiration
Diaphragm
Contracts into flatter when inspire
Intercostal muscles
External
o Fibers are down and inward
o Contract to pull ribs and sternum up and out to enlarge TC
Have to expend ATP
o Expiratory muscles
Passive at rest—don’t need ATP
Relax expiratory muscles
Abdominal muscles
Contract, push diaphragm up, squeeze air out from underneath
Internal intercostals muscles
o Help keep TC airtight
Pulmonary pressures
o Resting lung = between breathes
After you’ve inhaled, and exhaled
Functional residual capacity (FRC)
Amount of air left after you inhale and exhaleat rest
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows half of the first page of the document.
Unlock all 2 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
Monthly
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.