exam 1 Flashcards
endocardium is thickest in the
atria
perkinjie fibers have very less dense
myofibrils
bright stains on epicardium indicate the presence of
blood vessels
cardiac cells as as a functional sync due to the presence of
intercalated discs
the nucleus of cardiac muscles are located where
centrally
intercalated discs are only found on what cell type
cardiac
transmission of impulses in cardiac cells is due to the gap junctions btw
intercalated discs
purkinjie fibers use this energy source
glycogen
chambers of the heart are lined with
squamous epithelium
posterior trachea is made of
smooth muscle
columnar cells of trachea are lined with
cilia
purpose of cilia anywhere in resp tract
to expel mucous out
difference btwn terminal and resp bronchioles is
resp bronchioles have cuboidal epithelium with some alveoli
alveoli are made primarily of
squamous cells
these produce surfactant
pneumocyte
in infants, contraction of the diaphragm is different how
in adults, contraction results in decreased pressure and increased thoracic space, it is opposite in infants
Lack of O2 is
anoxia
lack of breathing
apnea
normal breathing at rest
eupnea
what is hypercapnia
increased levels of PaCO2 (arterial)
increased rate of breath is known as
hyperpnea
increased PaCO2 and decreased PaO2, and decreased rate of breathing
hypoventilation
so with hyperventilation, you don’t have enough
PaCO2
true ribs
1-7
upper ribs do what action
pump handle, ant to post
lower ribs do what action
bucket handle (side to side)
upper ribs are what plane
frontal
lower ribs are what plane
saggital
angle of louie is at rib
2
what 4 things are different in prenatal blood flow that do not exist after birth
umbilical vein, ductus venosus, ductus arteriosis, foramen ovale
coronary vessels are found in what heart layer
epicardium
cardiac muscle isn’t parallel like skeletal, rather it is in a
series
cardiac muscle is highly___ and is only muscle type to have___
striated, intercalated discs
resistance in the lungs while in womb is very
high
after birth, the resistance in the lungs should
drop
majority of prenatal blood travels to the aorta via the
ductus arteriosis
- Oxygenated blood from the placenta flows through the umbilical vein and enters the inferior vena cava through the
ductus venosis
what could cause the ductus arteriosis to remain open at birth
lack of arterial O2
LCA divides into
circ A and LAD A
This type of coronary vessel (vein) dumps into ventricles
thesbian
blood flows in the body due to pressure differences btwn
coronary and systemic circulation
The heart is innervated by the ___ sx
autonaumic ns
Which semilunar valve closes first
aortic
newborns have ____ alveolar surface area
less = more time for exchange
newborns compensate for breathing issues by doing what (vs adults)
increasing rate of breath instead of increasing depth
diaphragm in infants has less type __ fibers
I
neonates can experience apnea up to __ sec
20 sec
2 collateral back up structures that infants don’t possess
pores of kahn and lamberts canals
circ A runs where
AV groove
LAD runs where
IV groove
RCA supplies ___% to SA ___% to AV
60 SA 90 AV
nerve to intercostals
ventral ramus
most important accessory muscle for breathing
SCM
heart lies mainly under which portion of the sternum
body
outer most surface of the heart
epicardium
funnel chest is aka
pectus excavatum
barrel chested pts have issues with
getting air out
which position decreases lung space and vol
supine
approx normal BP for newborns
70/45
5 accessory muscles that elevate ribs
(pets) pec minor, SA, erector spinae, traps (traps indirectly), scalenes
nerve to erector spinae
dorsal ramus
nerve to scalenes
cervical 3-5
nerve to intercostals
ventral ramus
expiration is___
passive
in adults gas exchange happens at __ level
capillary
normal HR for newborn
190
normal RR newborn
30-60
in expiration, thoracic pressure
increases, forcing air out
with COPD pts, in order to get air out, they have to use ___ muscles
abdominal
after blood leaves aorta, it goes in what sequence
arteries, arterioles, capillaries, venules, veins