Which of the following most likely happens when astronauts go to space?
- Their heart rate speeds up because the blood vessels have less blood to circulate .
- Their heart rate speeds up because the blood vessels have more blood to circulate .
- The blood vessels in their neck caves in because the heart pumps less blood per beat.
- The blood vessels in their neck bulges out because the heart pumps more blood per beat.
Answers: 2
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Which of the following most likely happens when astronauts go to space?
- Their heart rate speeds...
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