Which hormone is responsible for regulating metabolism in the human body?

Which structure connects the two halves of a neuron, allowing communication between them?

What is the fluid-filled sac found in animal cells that stores water and waste products?

What is the product of the combustion of hydrocarbons in the presence of oxygen?

Which organ produces insulin and regulates blood sugar levels?

In the human reproductive system, where does fertilization typically occur?

Which blood vessels carry blood away from the heart?

What is the chemical symbol for iron?

What is the chemical formula for calcium carbonate?

What is the largest organ of the human body?