Science 1.3

What is the primary function of neurons in the body?

• To protect the body from infection

• To carry electrical signals and help different parts of the body communicate

• To transport nutrients to cells

• To break down food in the digestive system

What do neurons carry from the brain to muscles?

• Oxygen

• Blood

• Electrical signals

• Nutrients

What is an axon?

• A short strand of cytoplasm in a neuron

• A cell that protects the brain

• A very long strand of cytoplasm where electrical signals travel quickly

• A type of blood vessel

What are dendrites responsible for?

• Sending electrical signals to muscles

• Collecting electrical signals from nearby nerve cells

• Protecting the nucleus of a neuron

• Delivering blood to cells

Why are red blood cells smaller than most other cells in the body?

• To make them easier to divide

• To allow them to pass through tiny blood capillaries

• To increase their energy levels

• To enhance their ability to reproduce

What is the main function of red blood cells in the body?

• To fight infections

• To carry nutrients to cells

• To deliver oxygen to every part of the body

• To remove waste products

What substance in red blood cells carries oxygen around the body?

• Cytoplasm

• Hemoglobin

• Nucleus

• Plasma

Why do red blood cells not have a nucleus?

• To make room for more hemoglobin

• To improve cell division

• To increase their size

• To enhance their ability to absorb nutrients

Where are palisade cells found in plants?

• In the roots

• In the stems

• In the leaves

• In the flowers

What is the primary function of palisade cells?

• To transport water

• To support the plant

• To make food by photosynthesis

• To protect the plant from pests