The normal heart rate is between 60 and 100 beats per minute. If the sinus node is without nerves (for example a transplanted heart) the heart rate is about 80 beats per minute. Two types of nerves regulate the heart rate. The sympathetic nerve speeds up the heart rate with exertion or excitement.
Petty was a most indefatigable contriver, inventor, and organizer of industry. There is no one who can use me unless it be some petty state which needs mercenaries. Every petty bourgeois in a democratic community has a chance of rising and wishes to do so.
A Petty Officer Third Class is an E4. He or she would be equivalent to an Army or Marine Corporal. A Petty Officer is considered an NCO in other branches. They are junior leaders. They would be in charge of small working parties and minor details. They could have a few people working under them in a department or division. They aren't quite ready to be an LPO (Leading Petty Officer) but they do play a leadership role.