The nodal musculature of the heart has the capability to generate impulse:
1. | on stimulation by the sympathetic division of the autonomic nervous system |
2. | on stimulation by the parasympathetic division of the autonomic nervous system |
3. | on stimulation by the somatic neural division of the peripheral nervous system |
4. | without any external stimulus |
Match each item in Column I with one in Column II and select the correct answer from the codes given:
Column I | Column II | ||
A. | Closure of AV valves | a. | Second heart sound |
B. | Closure of semilunar valves | b. | First heart sound |
C. | Opening of AV valves | c. | Ventricular ejection |
D. | Opening of semilunar valves | d. | Passive ventricular filling |
Codes
A | B | C | D | |
1. | a | b | c | d |
2. | b | a | c | d |
3. | b | a | d | c |
4. | a | b | d | c |