SA node acts as a pacemaker of the heart because of the fact that it_________________?

Related Mcqs:

1. A patient with carinoma cheek has tumor of 2.5 cms located close to and involving the lower alveolus. A single mobile homolateral node measuring node measuring 6 cm is palpable. Based on these clinical findings TNM stage of the tumor is______________?

   A. T1 N1 Mo B. T2 N2 Mo C. T3 N1 Mo D. T4 N2 Mo...

2. The cortex of lymph node contains__________________?

   A. Cords of billroth B. Hassal’s corpuscles C. Lymphatic nodules D. While pulp...

3. Which of the following acts as a neurotransmitter inhibitor _______________?

   A. Glutamate B. GABA C. Aspartic acid D. Lysin...

4. Succinyl choline acts to block neuromuscular transmission by_______________?

   A. Inhibiting cholinesterase B. Inhibiting the CNS C. Depolarizing the motor end plate of skeletal muscle D. Blocking the release of acetyl choline at the end plate...

5. Hormones FSH & LH of anterior pituitary gland acts on___________________?

   A. Testis but not ovaries B. Ovaries but not testis C. Both Testis and ovaries D. Adrenal cortex...

6. All the heart valves are open during which stage of cardiac cycle __________________?

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

7. Cardiac output in L/min divided by heart rate equals_______________?

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

8. Parasympathetic stimulation of heart causes______________?

   A. SA node decreases firing B. Increased AV node excitability C. Decreased ventricular contraction D. Tachycardia...

9. Effect on force of contraction of heart is_____________?

   A. Chronotropic effect B. Dromotropic effect C. Bathmotropic D. Ionotropic effect...

10. 2nd heart sound is characterized by all except______________?

    A. Due to closure of semilunar valves B. Is occasionally split C. Has longer duration than 1st heart sound D. Marks the onset of diastole...