Medical MCQs

A. Reflex hyperpnea
B. Reflex hypercapnia
C. Reflex tachycardia
D. Reflex hypercapnia

A. Is capable of generating impulses
B. Has rich sympathetic innervation
C. Has poor cholinergic innervation
D. Generates impulses at the highest rate

A. Preload
B. After load
C. Heart rate
D. Myocardial contractility

A. Av node
B. Sa node
C. Sa node
D. Purkinje fibers

A. 2.5
B. 4.25
C. 5.25
D. 9.5

A. Cardiac efficiency
B. Cardiac index
C. Mean stroke volume
D. Mean arterial pressure

A. Isotonic relaxation
B. Isovolumetric relaxation
C. Isovolumetric contraction
D. Isotonic contraction

A. Systolic ejection
B. Isovolumetric relaxation
C. Isovolumetric contraction
D. None of the above

A. Does not operate in the failing heart
B. Does not operate during exercise
C. Explains the increase in cardiac output that occurs when venous return is increased
D. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

A. Aorta
B. Artery
C. Arteriole
D. Vein