Ch. 20 (The Heart & Neck Vessels) Flashcards
What part of the heart anatomy would be called the base?
the top
What part of the heart anatomy would be called the apex?
the bottom
There are three layers to the heart.
What layer is a tough sac that surrounds and protects the heart?
pericardium
There are three layers to the heart.
What layer is a muscular wall that does the pumping in the heart?
myocardium
There are three layers to the heart.
What layer is a thin wall that lines the inner surface?
endocardium
What happens during diastolic (bottom number-BP)?
blood floods into the heart
aortic & pulmon. valves are closing, S2 - best heard at erb’s/pulmonic
louder at base (DUB)
What happens during systole (top number-BP)?
pushes blood out to the system
mitral & tricuspid valve are closing, S1 - best heard at mitral & tricus
louder at apex (LUB)
What is happening during s1 (lub)?
mitral and tricuspid valve closing
systole -best heard at the tricuspid & mitral listening points
louder at apex (LUB)
What is happening during s2 (dub)?
aortic and pulmonic valve closing
diastole - best heard at erbs point/pulmonic area
louder at base (DUB)
We live most of our lives in what heart cycle?
diastole (2/3)
systole - 1/3
Where do we hear S1 loudest?
apex
Where do we hear S2 loudest?
base
What are some conditions that would cause heart murmurs?
- thickness (viscosity) of blood increases
- viscosity decreases
- valve problems (most common)
pregnancy can cause temporary murmurs
What does a heart murmur sound like?
a gentle “wooshing” sound
What portion of the heart contains specialized cells near the superior vena cava that initiates electrical pulse?
SA Node
natural pacemakers
What portion of the heart is located low in septum of right atrium, making it contract?
AV node
During heart conduction, the impulse travels into branches in the left atrium called what?
bundle of his
What is the equation used to calculate cardiac output?
CO = SV x R
stroke volume x rate = cardiac output
What are the main two neck vessels?
- carotid artery (in groove between trachea and sternomastoid process)
- jugular veins
What main neck vessel carries O2 blood to the head?
carotid artery