Will give 1: lungs function as part of the system and the system. circulatory; endocrine digestive; musculoskeletal excretory; respiratory immune; reproductive 2: what is the difference between an artery and a vein? an artery carries blood away from the heart; a vein carries blood to the heart. an artery is responsible for carrying blood; a vein is responsible for gas exchange. an artery is responsible for gas exchange; a vein is responsible for carrying blood. an artery carries blood to the heart; a vein carries blood away from the heart. 3: the system is made up of the nose, pharynx, trachea, lungs, bronchi, and alveoli. circulatory endocrine immune respiratory 4: read the following summary, which describes blood flow and heart output in space. then, answer the question. the heart doesn't have to do as much work to pump blood when in orbit. after only one day beyond earth's gravity, astronauts have a lower blood volume. they can lose as much as 20 percent of their blood volume while on a space mission. since the body has less blood to push around and the heart is pushing more blood with each beat, an astronaut's heart rate also slows down to compensate. what process is being described? breathing excretion homeostasis respiration 5: the system is responsible for moving blood cells throughout the body. circulatory endocrine immune respiratory