Surprising body changes in zero-G space environment

In space, the absence of gravity causes various changes in the human body. Astronauts can grow taller as their spines elongate, but this can lead to back pain. The heart becomes smaller and changes shape due to easier blood flow. Bones lose calcium and become brittle, necessitating exercise to maintain bone density. Vision can be affected by changes in intracranial pressure, requiring different glasses prescriptions. Despite these challenges, the exploration of space is considered worthwhile.

What happens to an astronaut's height in space due to the absence of gravity?

• It decreases by an inch.

• It fluctuates randomly.

• It remains the same.

• It increases by an inch.

Why does the heart change shape in space?

• Because it is affected by the cold temperature.

• Because it receives more blood from the feet.

• Because it doesn't have to work as hard to pump blood.

• Because it has to work harder to pump blood.

What is a consequence of bone changes in space?

• Bones lose calcium and become brittle.

• Bones become stronger.

• Bones become more flexible.

• Bones grow in size.

How does space travel affect vision?

• Vision becomes sharper.

• Vision improves due to better blood circulation.

• Vision remains unchanged.

• Vision can deteriorate due to changes in eyeball shape.

What precaution is taken on board to address potential vision changes?

• Different prescriptions of glasses are kept on board.

• Astronauts are given eye drops daily.

• Regular eye exercises are conducted.

• Special goggles are worn at all times.