Mastering Flashcards
The right and left atria depolarize and contract following the arrival of the action potential from the __________.
SA Node
The degree of stretch experienced by the sarcomeres in the ventricle cells before they contract is called __________.
Preload
How much blood is pumped from each ventricle during the ventricular ejection phase?
70 ml
Calculate the end-systolic volume (ESV) if the end-diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.
40 ml
Autorhythmicity in the heart is the responsibility of __________.
cardiac pacemaker cells
Inotropic agents affect __________.
contractility
Which hormone decreases cardiac output by decreasing blood volume and preload?
Atrial Natriuretic peptide
Which of the following decreases heart rate?
Acetycholine
What largely determines preload?
End-systolic volume (ESV)
A damaged atrioventricular (AV) bundle or atrioventricular (AV) node will primarily affect the length of the __________.
P-R interval
Blood in the right atrium should travel next past the __________.
tricuspid valve and into the right ventricle
What normally serves as the pacemaker of the entire heart?
Sinoatrial Node (SA node)
During what part of the action potential will calcium ions enter the contractile cell?
Plateau phase
Which of the following can be used to measure heart rate?
R-R interval
Which pressure remains the same along the length of the capillary?
Colloid osmotic pressure
Which blood vessels experience the sharpest decrease in blood pressure?
systemic Arterioles
What name does the femoral artery take as it emerges in the posterior thigh?
Popliteal Artery
Which of the following hormones decreases heart rate, and thus cardiac output and blood pressure?
Acetylcholiine
Under what conditions will the myogenic mechanism slow blood flow into a capillary bed?
Rising Arteriolar Presusure
What type of capillaries have large pores within their endothelial cells and are the leakiest?
Sinusoidal capillaries
Blood pressure is equivalent to __________.
hydrostatic pressure
Determine fluid movement when hydrostatic pressure exceeds colloid osmotic pressure at the arteriolar end of the capillary.
Water is pushed out of the capillary by filtration
Which of the following connects vessels through vascular anastomoses?
Collaterals
Into which vein does blood in the external jugular vein drain?
Subclavian Vein
