Brains Sweep Themselves Clean Of Toxins During Sleep

What happens to brain cells during sleep according to the study?

• They multiply to increase brain capacity.

• They shrink, allowing fluid to flow easily.

• They grow larger to store more information.

• They become inactive and stop functioning.

What is the main function of cerebrospinal fluid during sleep?

• To increase brain temperature.

• To nourish brain cells.

• To transmit nerve signals.

• To clear away toxins.

Why is sleep considered dangerous from an evolutionary perspective?

• It makes animals more vulnerable to predators.

• It reduces the ability to find food.

• It increases the risk of diseases.

• It causes brain cells to shrink.

What analogy is used to describe the cleaning process of the brain?

• A vacuum cleaner.

• A dishwasher.

• A washing machine.

• A broom.

What substance linked to Alzheimer's is cleared from the brain during sleep?

• Beta-amyloid.

• Glucose.

• Dopamine.

• Serotonin.

Why doesn't the brain clean itself all the time?

• It is too busy processing memories.

• It requires too much energy.

• It can only clean during the day.

• It needs to focus on digestion.

What happens to beta-amyloid levels when a person is awake?

• They disappear.

• They increase.

• They remain constant.

• They decrease.

What is the potential new approach to Alzheimer's prevention mentioned?

• Controlling sleep to improve beta-amyloid clearance.

• Increasing brain activity during sleep.

• Reducing brain size.

• Enhancing memory retention.

What is the main reason animals have evolved to need sleep?

• To conserve energy.

• To dream.

• To clean the brain of toxins.

• To avoid predators.

What happens to brain cells when an animal wakes up?

• They multiply.

• They shrink.

• They enlarge.

• They disappear.