The human body system that controls the body's reactions to the outside world. It is the system that controls the actions, emotions, thoughts, memories, sensations, and senses.
Events or conditions that cause a living thing to react.
Another word for nerve cells which carry messages throughout the body.
The main part of a neuron.
The short strands branching out from the cell body of a neuron.
The single, long strand that comes out of the other side of the cell body.
The gap between two neurons.
The main control center of the nervous system.
The part of the brain responsible for learning, reasoning, memory, and the senses.
The part of the brain responsible for smooth, coordinated movement.
The part of the brain responsible for controlling vital functions such as heartbeat, breathing, and blood pressure.
The human body system that supports the body and gives it shape, protects internal organs, and makes new blood.
Give the basic shape to the body. An adult has 206 of them.
The place where two or more bones meet.
Strong bands of connective tissue that holds the bones in a joint together.
The soft tissue in the middle of a bone which produces new blood cells.
A break in a bone.
The human body system that causes movement of the body parts and also helps with digestion and circulation.
Muscles that you can control consciously.
Muscles that automatically do their jobs without you needing to think about it.
Tough bands of connective tissue that connects the muscles to the bones.
The human body system that transports oxygen and nutrients to the body, takes carbon dioxide back to the lungs, and fights infections with white blood cells.
The organ that pumps blood throughout the body.
One part of the blood which is mostly water and makes up half the blood.
The blood vessels that carry oxygenated blood away from the heart.
The smallest vessels that connect the arteries and the veins.
The blood vessels that carry blood back to the heart.
The two upper chambers of the heart.
The two lower chambers of the heart.
The main transporter of blood and the largest artery.
The human body system that provides oxygen through breathing.
Where air is inhaled, filtered, warmed and moistened.
The flap of tissue that prevents food from entering the windpipe.
The tiny air sacs at the end of the bronchi in the lungs.
The dome-shaped muscle found under the rib cage which is important for breathing.
The human body system that breaks down food to be used throughout the body.
The place where saliva is stored and then secreted into the mouth.
The secretion from the salivary glands.
The muscle that helps push food to the back of the mouth where it is swallowed.
The muscular tube food passes through to get to the stomach.
The muscular action which helps move food through the esophagus and through the rest of the digestive system.
A j-shaped sac that stores and further digests food.
A very long, coiled, tube-like organ that absorbs the nutrients from food.
A storage sac that holds the bile produced by the liver.
Produces pancreatic juices used in digestion.
Tiny finger-like structures that line the inner wall of the small intestine.
A tube-like organ that absorbs water from food.
The place where solid waste is stored.