Lab Heart and Cardiovascular Physiology Flashcards
(41 cards)
How much does a heart weigh
2/3 of a pound
What is the pulmonary circuit
Lungs and back (right)
What’s the systemic circuit
Body and back (left)
What is the myocardium made of
Mostly cardiac muscle
What is the endocardium made of
Simple squamous epithelium
What does pulse do
Increase pressure in artery during systole
What is systolic pressure
The upper larger value 120
What is diastolic pressure
The lower number 80
What causes contraction
Systolic pressure
What causes relaxation
Diastolic pressure
What are the Korotkoff sounds
Sounds heard when measuring blood pressure
What are the heart sounds
Lub dub valves closing
What does the sound lub do
AV valves closing
What does this sound dub do
Semi lunar valves closing
What is a murmur
Improper valve closing
What is an irregular fast atrial rhythm
Atrial flutter
What is a more serious irregular rhythm due to tobacco and alcohol
Atrial fibrillation
What is hypertension
 blood pressure above 140/90
What is hypotension
Low blood pressure
What regulates the cardiac conduction system
Medulla oblongata
What does the SA node do
Generates impulses
What do the atrioventricular bundle do
Connects atria to ventricles
What do the bundle branches do
Conduct the impulses through the interventricular septum
What do the Purkinje fibers do
Depolarize the contractile cells of both ventricles
