The Nervous System

Question 1

When Maya feels a sudden bee sting on her finger, she jerks her hand back in a split second. Which statement best explains why this happens so quickly?

Accepted Answer

The nerve signal travels very fast from the finger to the spinal cord and back to the muscles, making the response almost immediate.

Answer

The brain first decides the sting is painful, then sends a slower signal to the muscles to move.

Answer

Hormones in the blood tell the muscles to contract after the sting is detected.

Answer

Muscles automatically contract without any signal when they are touched.

Question 2

Fill in the blanks: The nervous system has two main divisions. The includes the brain and spinal cord, and the includes all the nerves that spread throughout the body.

Accepted Answer

central nervous system; peripheral nervous system

Answer

central nervous system; central nervous system

Answer

peripheral nervous system; peripheral nervous system

Answer

brain and spinal cord; nerves throughout the body

Question 3

When Maya quickly pulls her hand away after touching a frozen slice of pizza, which explanation correctly describes why her body can move so fast?

Accepted Answer

The sensory nerve sends a signal to the spinal cord, which instantly sends a signal back through a motor nerve to the muscles; the signals travel at very high speed, so the movement occurs before the brain even registers the cold.

Answer

Maya’s brain first thinks about the cold and then tells her muscles to move, which takes only a few seconds.

Answer

The cold temperature spreads directly through the skin and makes the muscles contract on its own.

Answer

The blood vessels in the hand expand quickly, pushing the hand away.

Try three questions

When Maya feels a sudden bee sting on her finger, she jerks her hand back in a split second. Which statement best explains why this happens so quickly?

Fill in the blanks: The nervous system has two main divisions. The includes the brain and spinal cord, and the includes all the nerves that spread throughout the body.

When Maya quickly pulls her hand away after touching a frozen slice of pizza, which explanation correctly describes why her body can move so fast?

Keep going on this shelf

The Nervous System

Try three questions

When Maya feels a sudden bee sting on her finger, she jerks her hand back in a split second. Which statement best explains why this happens so quickly?

Fill in the blanks: The nervous system has two main divisions. The ________ includes the brain and spinal cord, and the ________ includes all the nerves that spread throughout the body.

When Maya quickly pulls her hand away after touching a frozen slice of pizza, which explanation correctly describes why her body can move so fast?

Keep going on this shelf

Fill in the blanks: The nervous system has two main divisions. The includes the brain and spinal cord, and the includes all the nerves that spread throughout the body.