Science Crossword

Elastic, hollow, muscular organ that provides temporary storage for urine
A blood vessel that carries blood back to the heart.
main organ of the respiratory system
A tube that carries urine from kidney to bladder
a nerve cell
an automatic movement in response to a stimulus 
A tube through which urine flows from the body
strong, flexible tissue that covers the ends of the bones
the gap between two neurons 
proteins that help break down large molecules into smaller molecules
where two or more bones meet
outer membrane that surrounds the bone
a disease in which joints become irritated or inflamed
A blood vessel that carries blood away from the heart
the movement of air into and out of the lungs
Each of the two upper chambers of the heart that receives blood that come to the heart
Each of the two lower chambers of the heart that pumps blood out of the heart
the yellowish, liquid part of blood that transports blood cells
Microscopic blood vessels that exchange nutrients and waste
a thin, watery liquid made of broken down food molecules and gastric juice
A muscular tube that connects the mouth to the stomach.
bean-shaped organ that filters wastes from the blood
A disease causing agent
resistance to specific pathogens
an overly sensitive immune response to common antigens