Anatomy and physiology revision

5. the inner most covering of the heart
9. part of the conducting airways that are not involved in gas exchange
10. where the coronary arteries originate
11. cardiac valves open and close based on this
12. reduces the surface tension in the alveoli
13. this structure secretes a small amount of fluid to reduce friction
14. main muscle involved in breathing
16. these stimulate other cardiac muscle cells (2 words, no space between words)
17. a hormone that stimulates the bone marrow to produce RBC
19. the structure in the kidney that allows filtration of fluid and small molecules
20. one of the structures in the upper respiratory system
21. the urine forming organ
24. considered the functional unit of the kidney
25. these structures contain valves to aid in the return of blood to the heart

1. the transport system of the cardiovascular system
2. the amount of air moved in and out of the lung with each normal breath (2 words, no space between words)
3. muscle that contracts during voiding
4. the second phase of urine formation (2 words, no space between word)
6. one of the atrioventricular valves (2 words, no space between)
7. the coronary arteries fill during ....
8. the primary function of the respiratory system (2 words, no space between words)
15. the term used to describe the contraction of the heart muscle
18. this lung has 3 lobes
22. initiates the renin-angiotensin-adosterone pathway
23. blood flow is calculated based on the following way