PART 1 Flashcards
The exchange between the aveolar gas and the blood
external respiration
exhange of gases between blood and tissues at the cellular level
internal respiration
exhange of gases between blood and tissues at the cellular level
internal respiration
gas exhange occurs to what kind of diffusion? Due to?
a. Siimple diffusion
b. due to gas pressure gradients
3 kinds of period in the development of the RS
Embryonic Period, Fetal Period, Alveolar period
Injury to the embryo or genetic damage during the embryonic phase of development can lead to many congenital problems including
tracheoesophageal fistulas, esophageal atresia, choanal atresia, pulmonary hypoplasia, coomplex heart, vascular anomalies
Infants who are younger than ______ are at greater risk for developing respiratory distress, among other reasons to the lack of mature alveoli in the lungs
32 weeks
occurs during the first 8 weeks of pregnancy.
embryonic period
Major organs will develop during this period
embryonic period
occurs during the remaining 32 weeks of pregnancy.During this period, the organs continue to develop and refine their structure and function
fetal period
Structure that is made up of three distinct germinal tissue layers that ultimately form all tissues and organs
embryo
3 distinct germinal tissue layers that ultimately form all tissues and organs
endoderm,mesoderm, ectoderm
Respiratory tract
Digestive tract, bladder, and thyroid
Liver and pancreas
endoderm
Dermis and muscles
Bone, connective and lymph tissue
Reproductive and cardiovascular system
mesoderm
Epidermis, hair, and nails
Lens of eyes and skin glands
Central and peripheral nervous system
ectoderm
approximately 6-16 weeks of development, lung and airway growth has the appearance of a glandular structure.Development of cilia, mucuos gands
pseudoglandular stage
What week is the growth and branching of the tracheobronchial tree and pulmonary vasculature continue and culminate with the formation of the terminal and respira¬tory bronchioles.
10th week(Pseudoglandular stage)
begins at week 16 and continues until week 26.
canalicular stage
more ter¬minal bronchioles and their associated acini form and develop from 26 weeks to birth. The formation of the total number of terminal bronchioles is complete at the end of this phase
Terminal saccular stage
The development of mature alveoli,(32 weeks to 8 years accompanied by capillary proliferation around their outside walls, marks the final phase of lung development.
Alveolar period
Human pulmonary surfactant which promotes lung inflation and protects the elveolar surface begins to produces around what weeks?
24-25 week
the actual gas exchange for the fetus
maternal placenta
3 important bypasspathways or shunts function in the developing fetus
Ductus venousus, ductus arteriosus, foramen ovale
it enhances the flow of blood to the developing organs
shunts
how many percent of fetal blood bypasses the pulmonary circulation from formane ovale to ductus arteriosus?
90%
basic gas-exchanging unit of the lung.
acinus
Fetal pH is normally 0.1 unit lower than maternal pH
TRUE OR FALSE?
TRUE
The O2 content and delivery by fetal blood are almost the
same as adult blood despite the much lower PO2.
TRUE OR FALSE?
TRUE
In fetal circulation aproximately one-third of this blood
flows to ?
lower trunk and extremities
The other two-thirds
flows through the ______ bypassing the liver’s circulation,
and flows to the inferior vena cava.
ductus venosus
Approximately 50% of this blood is shunted from
the right atrium into the left atrium through an opening in the
interatrial septum called the
foramen ovale
Before birth, _______% of the fetal blood bypasses the
pulmonary circulation through the foramen ovale and the ductus arteriosus
(right-to-left shunting). Any additional shunting after birth is considered an
anomaly.
90%
A newborn’s larynx lies higher in the neck than the larynx
of an adult, with the glottis located between C3 and C4, and is
more funnel-shaped than that of an adult. TRUE OR FALSE?
TRUE
The epiglottis of an infant
is longer and less flexible than the epiglottis of an adult and lies
higher and in a more horizontal position. TRUE OR FALSE?
TRUE
It is a cone-shaped cavity that houses
the lungs, heart, and the contents of the mediastinum.It protects the vital organs within and is capable of
changing shape to enable air to be moved into and out of the
lungs.
Thorcacic Cavity
The inner layer of the
thoracic wall in contact with the lungs is lined with a serous
membrane called the
parietal pleura
the
outer surface of the lungs.
Visceral Pleura
long, vertical flat bone found on the anterior
side that is composed of three bones: the manubrium, the body
(or gladiolus), and the xiphoid process.
sternum