test 3 - CV system pt2 Flashcards
the heart is located in which body cavity?
thoracic cavity in the mediastinum
the lungs sit in which body cavity?
thoracic cavity - each in their own pleural cavity
the heart is slightly rotated to the _____
left
the _____ makes up the right wall of the heart
right atrium
the _____ makes up the inferior border of the heart
right ventricle
the _____ makes up the left border of the heart
left ventricle
the ____ is tucked behind the heart due to the rotation of the heart
left atrium
what is the role of the fibrous layer of the pericardium?
support the heart in the mediastinum
what is the most outer layer of the pericardium?
fibrous pericardium
which layer of pericardium is found deep to the fibrous pericardium?
parietal layer of the serous pericardium
what is found between the parietal and visceral layers of the serous pericardium?
pericardial space/cavity
what is another term for visceral layer of serous pericardium?
epicardium
functional syncytium - def
contraction/depolarization of one myocyte will cause contraction of other cells throughout the myocardium
which layer of the heart wall is continuous with the great vessels?
endocardium
how do the inner linings of the atria differ from the ventricles?
atria - smooth
ventricles - rough
what type of muscle is cardiac muscle?
involuntary striated muscles
intercalated discs - def
fibrous structure bonding cells together
function of gap junction
get muscle cells of heart to function as one unit
label superficial heart anatomy model
lab 6 page 3
trabeculae carnae - def
rough surface of ventricular walls
all valves in the heart are passive
true or false?
true
which arteries supply the heart with blood?
coronary arteries
label coronary blood vessels
lab 6 page 5 and 6
which artery is the main blood supply for the heart in most people?
posterior interventricular which comes off the right coronary artery (some people, it branches to the left)
the superior and inferior vena cava, and the coronary sinus all get emptied where?
right atrium
the heart needs NS stimulation to contract
true or false?
false
describe the conduction pathway of the heart
- SA node - pacemaker of the heart - depolarizes - causes contraction of atria
- impulse goes through internal pathway to AV node - slows electrical impulse to make sure atria don’t contract at the same time as ventricles
- impulse reaches inter ventricular septum
- purkinje fibers - ventricles contract
how does the sympathetic NS regulate HR (pathway)?
pathway:
- sympathetic preganglionic fiber
- sympathetic ganglia (cervical and superior thoracic ganglia T1-T4)
- sympathetic postganglionic fiber
- cardiac nerve
how does the parasympathetic NS regulate HR (pathway)?
- parasympathetic preganglionic fiber
- synapses in cardiac plexus
- parasympathetic postgaglionic fibers
