Internal regulation of myocardial contraction MCQs

1. The electrical activity for the contraction of the heart is initiated by the;
a. sinoatrial node 
b. atrioventircular node
c. medulla oblongata
d. myocytes

2. The only point of electrical conduction between the atria and the ventricles is provided by the;
a. Sinoatrial node
b. Atrioventricular node
c. Atrioventricular bundle 
d. Purkinje fibres

3. The electrical impulse from the atrial myocardium are collected by the
a. Sinoatrial node
b. Atrioventricular node   
c. Atrioventricular bundle
d. Purkinje fibres

4. Sympathetic stimulation of the heart will 
a. Increase heart rate 
b. Reduce heart rate
c. Have no effect on heart rate
d. Reduce stroke volume

5. Parasympathetic stimulation the heart is provided via the;
a. Phrenic nerves
b. Thoracic spinal nerves
c. Cervical spinal nerves
d. Vagus nerve