Quiz 1 Review Flashcards
Which sound is shorter in duration with a much higher frequency?
S2
Laminar flow, also called streamlined flow represented the flow of liquids in layers or streams, which laminar has the greatest velocity?
the laminar in the center of the vessel
A healthy resting ejection fraction would be?
65%
The resting membrane potential of ventricular myocytes is
-85mV
The correct units for cardiac output is
mL/min
L type ion channels allow which ions to flow through?
sodium and calcium
The sympathetic nervous system can increase HR and increase the force of contraction. Increased contractions would _____?
decrease ESV
A plateau is seen on a tracing of a ventricular action potential, how long is this event?
0.2s
Which of the following membranous junctions allow cardiac muscle to contract as a syncytium?
A) aquaporins
B) gap
C) desmosomes
D) occluding junction
E) hemidesmosomes
B) gap
When the ventricles contract, the bicuspid (mitral) valve prevents blood from flowing from the
left ventricle to left atrium
A blood vessels diameter dilates from 1 to 4, flow through that vessel will increase from 1ml/min to about
256 ml/min
How much blood do you have within your body at this given time?
5L
The Frank-Starling mechanism describes?
the energy of contraction is proportional to the initial length of a cardiac fiber
Which of the following blood vessels has the highest capacitance?
A) small veins
B) arterioles
C) venues
D) aorta
E) vena cava
E) vena cava
The greatest factor determining vascular resistance is
diameter (radius) of vessel
When blood vessels are arranged in series, which of the following is true?
A) the resistance of one vessel in series does not affect another vessel
B) pressure never changes within the vessels
C) there are many branches of the main distribution artery
D) blood flow at each part of the circuit is identical
D) blood flow at each part of the circuit is identical
Reynolds number (Re or Nr) is used to
determine if flow will be laminar or turbulent
Which of the following cardiac valves does blood from the venae cava pass through first?
tricuspid
Quantity of blood that flows per minute=
cardiac output
The quantity of blood that is pumped each cycle=
stroke volume
The volume of blood ejected as a % of the EDV=
ejection fraction
The volume the LV fills with each diastolic cycle=
preload
What does the Fick principle refer to?
utilization of oxygen
Which of the following, by decreasing blood viscosity can increase blood flow at a given perfusion pressure?
A) decreased concentration of RBCs
B) decreased temp
C) increasing conc. of platelets
D) dehydration
E) low flow states
A) decreased concentration of RBCs
