These activities change heart rate by changing the balance of parasympathetic and sympathetic stimulation of the heart. sort each of the activities according to whether it decreases or increases heart rate. drag the appropriate items to their respective bins. hints reset digesting a meal standing up exercise fight or anger lying down decrease heart rate increases heart rate

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.