#unit2 Flashcards
5 great vessel of the heart
svc Ivc , pulmonary artery pulmonary vein aorta
CV system -
HEART , blood vessels and blood .
function of the heart
-heart rate maintain BP
-RATE and force of contraction influence Bp and blood flow to organ
-atria produce hormone ( ANP) ( hormone by heart )
what does Anp do to your body?
lower BP by decreasing sodium in your kidney
pericardium
Membrane around the heart
fibrous pericardium
outer most layer
serous pericardium
producers serous fluid
-parietal pericardium ( inner layer of fibrous pericardium )
visceral pericardium or epicardium ( attach to heart surfaced reduced friction and HB )
Heart WALL
epicardium - outermost layer
myocardium- middle layer ( muscle heart )
fibrous Dense irregular act collagenous
endocardium / innermost layer endothelial layer
the valves do what
make sure blood move in on direction
chordae tendiness
papillary muscle
work together to make sure blood flow in one direction through heart preventing back flow
2 Atria
receive blood from vein
ventricle
eject blood to arteries
pump it to arteries
pectinate muscle
muscular ridges inside RA
Interatrial septum
wall between RA and LA
FOSSA OVALIS
indentation from RA & LA. remanent of opening from fetal
Trabeculae carnea
(line) ridges surface in ventricle ( to increase surface area
LV WALL IS?
3x thicker
than RV
av node
40 bpm
locate tricuspid valve
node delay
allow atria to depolarize
sinatrial node
locate upper RIGHY ATRUIM
60-100 bpm include by SNS AND PSN
Main peacemaker of heart
P wave
depolarization of astria
Qrs
ventricular depolarization
T wave
ventricular repolarization
S1 S2
S1Lub av valve close
s2 Dub semilunar valve close (pulmonary & aorta
Heart rate
60-100bpm
stroke volume
70 beats
cardiac output Co
volume of blood blood pump from pulmonary and systemic system
CO IS
co =heart rate x stroke volume
72 beats /min x 70 ml/beat =5040 ml/min
5liters /min Co
Heart regulate by
Nervous & endocrine system
adrenal medulla
increase heart rate by release EPI NEPI TRYROID HORMONE AND GLUCAGON
INFLUENCED BY SNS
Blood volume
mean total of blood pump in body
to increase it release Aldosterone and antiduirectic
to lower IT ANP
Aldosterone and antiduirectic
signal your kidney to hold on sodium and water ( anti)
cO is increase
It’s SNS, a adrenal medulla hormones, and also blood volume hormones and also ECF
interventricular sulcus
external depression betwen RV AND LV
atrioventriculars sulcus
external indentation between atria and ventricle
bradycardia
less <60bpm
tachycardia
> 100 bpm
sinus tachycardia
regular beat but faster
factors that influence HEART RATE / Sa node
chronotropic agents
positive -Sns
Negative Psn
blood pressure normal range
120/80
