Assertion: whale | /r/CapableOf | slow their heart rate
Facets:
value: to conserve oxygen
type: PURPOSE
Source sentences:
text: In addition to their streamlined bodies, they can slow their heart rate to conserve oxygen; blood is rerouted from tissue tolerant of water pressure to the heart and brain among other organs; haemoglobin and myoglobin store oxygen in body tissue; and they have twice the concentration of myoglobin than haemoglobin.