TED-Ed: Gravity and the human body - Jay Buckey

The video discusses the physiological effects of long-term space travel on humans, focusing on bone and muscle loss, cardiovascular changes, and balance system adaptations due to weightlessness. It explores how these systems, which evolved under Earth's gravity, might develop differently in space. The video also references an experiment by Hubel and Wiesel to illustrate how lack of stimuli can lead to permanent changes in development, raising questions about how humans might adapt if raised in a gravity-free environment.

What happens to the muscles and bones of astronauts during extended periods in space?

• They become stronger due to increased use.

• They become more flexible.

• They remain unchanged.

• They lose mass and strength.

How does the cardiovascular system adapt to weightlessness in space?

• It increases blood pressure.

• It becomes more efficient at pumping blood.

• It requires less effort to pump blood.

• It stops functioning.

What is a noticeable effect on astronauts' balance when they return to Earth from space?

• Increased risk of falling.

• Difficulty maintaining balance.

• No change in balance.

• Improved balance and coordination.

What is the main concern about human development in a gravity-free environment?

• Certain systems might develop differently.

• Humans would not survive.

• Development would be identical to Earth.

• Humans would develop superhuman abilities.

What did the experiment by Hubel and Wiesel demonstrate about sensory development?

• Sensory development is solely genetic.

• Lack of sensory input can lead to permanent changes.

• The brain can adapt to any sensory input.

• Sensory development is unaffected by environmental changes.