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Science Crossword

Vessels in the circulatory system that carry blood away from the heart
Male sex cell
Tube that passes urine from the bladder to the outside the body
A protein in the body that helps controls a chemical reaction, such as digestion
System of organs that control body activities through chemical messengers
The opening at the end of the digestive system
A sac that stores bile
Organ in the digestive system that produces bile and enzymes
Two lower cambers of the heart
Part of the digestive system
Tubes that pass urine from the kidney to the urinary bladder
Organ that pumps blood throughout the body
Tube that carries food from the mouth to the stomach
Keeping conditions constant in the body
Specialized organs that make substance (hormones) that control and regulate body process
Pair of organs in respiratory system
Vessel that carries blood toward the heart
Smallest vessel in the circulatory system
Female sex cell
Disease causing, non-living particle , reproduces only in living cells