Exam 2: Quiz Flashcards
Which vascular bed has the highest cross-sectional areas?
Capillaries
Which tissue receives the greatest percentage of cardiac output during resting conditions?
Brain
In which vessels does control of blood flow mainly occur?
Arterioles
What terms accurately describe a sudden decrease in conduction velocity of the heart?
a. positive
b. dromotropy
c. lusitropy
d. chronotropy
e. negative
b and e
What happens to resistance in a blood vessel as radius of the vessel increases?
decreases
Systolic arterial blood pressure = 120 mmHg
Diastolic arterial blood pressure = 75 mmHg
HR = 85 bpm
What is the MAP?
90 mmHg
End-diastolic volume = 35 mL
End-systolic volume = 19 mL
HR = 70 bpm
What is the cardiac output?
1.12 L/min
A 440kg horse has an end-diastolic volume of 740 mL and a stroke volume of 520 mL. What is the ejection fraction?
70%
A 20 kg lamb has an end-diastolic volume = 45 mL, end-systolic volume = 12 mL and HR = 90 bpm. What is the stroke volume?
33 mL
What is the HR if the RR interval is 325msec?
185 bpm
Which ion is responsible for the upstroke in Phase 0 of a cardiac action potential?
Na+
What type of receptor is primarily responsible for vasoconstriction of arteries and veins?
Aplha-1 adrenergic receptor
T/F: During the effective refractory period, a stimulus may locally excite the tissue, but conduction of an aciton potential can’t occur - some Na+ channels are starting to open during this period.
True
Which type of blood vessel holds the unstressed volume?
Veins
T/F: As HR increases, intracellular Ca concentrations increase due to more Ca entering cell and more AP’s per unit time.
True
