In humans, gas exchange and gas transport occur as a result of the functioning of a system of:
A. setae.
B. ganglia.
C. phloem tubes.
D. lungs and blood vessels.
The grasshopper takes in oxygen through openings called spiracles. Air then travels through a series of tracheal tubes and the exchange of gases occurs at tiny air sacs located throughout the body. Phloem tubes are food transporting tubes in plants, ganglia are bunches of nerve cells in earthworms and grasshoppers, and setae are locomotive structures used in the earthworm.