Which cells of the circulatory system aid in fighting off infections

Which organ do most nutrients get absorbed into?

Which organ produces insulin to regulate the body's sugar levels?

All systems working together to maintain a stable environment is called

It is the primary sex hormone in males that gives rise to secondary male characteristics such as deeper voice, facial hair, and muscle development.

The egg and sperm uniting is called

Which organ is responsible for filtering out blood.

What are the cells that are responsible for sending messages to the brain and spinal cord?

Which system produces and releases hormones through glands

Which part of the female reproductive system is the site of fertilization?

What system removes waste from the body and includes the skin, lungs, kidneys and large intestine?

The act of chewing to break up food into smaller pieces is a type of what digestion

Which system is responsible for sending and receiving messages?