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WorksheetsChapter 19 Part 3
Total questions: 8
Worksheet time: 4mins
Chemoreceptors react to all the following EXCEPT:
Decreased O2
Increased CO2
Decreased Blood pressure
Decreased pH
The amount of blood (mL) coming from one ventricle in one minute is called:
the preload
the afterload
the stroke volume
the cardiac output
When the left ventricle contracts the _____ valve closes and the _____ valve is pushed open.
bicuspid; pulmonary
tricuspid; aortic
mitral; aortic
tricuspid; pulmonary
The heart rate is increased by:
hypothyroidism
acetylcholine
norepinephrine
vegas nerve stimulation
Which of these does not DIRECTLY contribute to cardiac output (CO)? Hint: think of the CO equation
EDV
ESV
Heart rate
Blood pressure
The cardiac center, which modifies the heart rate, is located in:
the SA node
the AV node
the aortic arch
the medulla oblongata
A substance that reduces the strength of contractility is said to exert:
a positive inotropic effect
a negative chronotropic effect
a positive barotropic effect
a negative inotropic effect
Which one of the following parts of the conduction system directly stimulates the ventricles?
SA node
AV node
Purkinje fibers
bundle of His
