Biology, 30.10.2021 06:30 math31343

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.

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