Question

The function of vagus nerve innervating the heart is to:

• A. Initiate the heartbeat
• B. Reduce the heartbeat
• C. Accelerate the heartbeat
• D. Maintain constant heartbeat

Answer 1

The correct option is B Reduce the heartbeat

Vagus nerve is one of the 12 cranial nerves present in human beings. Cranial nerves are those nerves which arise from the brain. They are designated with Roman numerals as I, II, II, etc. to indicate the order in which nerves arise from the brain. Vagus nerve is at 10th position. Vagus nerves form the part of involuntary nervous system. It is the only cranial nerve which extends beyond the head and neck to thorax and abdomen. It innervates the pharynx, oesophagus, larynx, lungs, stomach, hear and intestines. It is a mixed nerve. It innervates the sinoatrial node of heart. It reduces the heartbeat.