Male reproductive cells

Female reproductive cells

A strong, flexible tissue that covers the ends of bones

Where two or more bones meet

Tissue that connects two bones

A voluntary muscle that attaches to bones

An involuntary muscle found only in the heart

Involuntary muscles that are smooth in appearance

The mechanical and chemical breakdown of food into small particles that your body can absorb and use

A muscular tube that connects the mouth to the stomach

Waves of muscle contractions that move food through the esophagus and the rest of the digestive tract

Bean-shaped organ that filters, or removes, wastes from blood

A muscular sac that holds urine until the urine is excreted

Main organs of the respiratory system

A large muscle that contracts and relaxes to move air in and out of the lungs

Upper two chambers of the heart

Lower two chambers of the heart

A vessel that carries blood away from the heart

A vessel that brings blood toward the heart

A cluster of small spongy structures that filter particles from lymph

An organ that recycles worn-out red blood cells and produces and stores lymphocytes

Part of the brain that controls memory, language and thought

Part of the brain that coordinates voluntary muscle movement and regulates balance and posture

Area of the brain that controls involuntary functions and connects the brain to the spinal cord

A chemical that is produces by an endocrine gland in one part of an organism and is carried in the bloodstream to another part of the organism