Body Systems Crossword

3. An organ shared between the digestive system and the respiratory system
7. Innermost layer of tissue in artery walls
9. Viruses and microorganisms which cause disease
10. An organ shared between the digestive system and the excretory system
11. A bundle of nerve fibers
13. Nonliving thing that can only reproduce inside of living cells
14. Markers used to determine if something belongs in the body
17. The part of the neuron which receives information and takes it towards the cell body
18. The part of the neuron which carries messages away from the cell body towards the next cell
20. A chemical messenger which controls the activities of different organs and acts as an internal stimuli
22. An organ shared between the digestive system and the endocrine system
23. The organ which contains the vocal cords

1. An automatic response which occurs very rapidly and without conscious control
2. The part of the brain responsible for controlling the endocrine system
4. A chemical produced by the body to destroy a certain kind of pathogen
5. The process in which oxygen and glucose undergo a complex series of chemical reactions to produce energy
6. Primary energy-providing nutrient
8. A neuron that carries nerve impulses from one neuron to another
9. Last name of the author of "On Germ Theory"
12. The space between the axon of one neuron and the dendrite of the next neuron
15. The stress response hormone
16. A waste chemical produced by the breakdown of proteins which allows the body to safely excrete nitrogen
19. A cell which carries information through the nervous system
21. Outermost layer of the skin