Across
- 2. A thin-walled chamber of the heart that receives blood from veins.
- 5. A white blood cell that produces antibodies.
- 7. Muscle that contracts without external nerve stimulation.
- 8. A heart valve that prevents the backflow of blood from a ventricle into an atrium.
- 13. Maintenance of body temperature within a range that enables cells to function efficiently.
- 15. Fluid that occupies the spaces between cells and tissues; includes plasma and interstitial fluid.
- 16. A blood vessel that carries blood away from the heart.
- 17. The pressure of the blood in the circulatory system.
- 20. The system of blood vessels that carries oxygenated blood to the tissues of the body and deoxygenated blood back to the heart.
- 21. A small mass of tissue in the right atrium that originates the impulses stimulating the heartbeat.
- 22. A division of the autonomic nervous system that returns the body to normal resting levels following adjustments to stress.
- 26. A blood vessel that connects arteries and veins; the site of fluid and gas exchange.
- 27. Change in the diameter of the arteries following heart contractions.
- 28. A small mass of tissue in the right atrioventricular region through which impulses from the sinoatrial node are passed to the ventricles.
- 29. A device used to measure blood pressure.
- 32. A mass of tissue that stores lymphocytes and removes bacteria and foreign particles from the lymph.
- 34. The widening of blood vessels, allowing more blood to the tissues.
- 36. A lymphoid organ that acts as a reservoir for blood and a filtering siate for lymph.
- 37. The narrowing of blood vessels, allowing less blood to the tissues.
- 39. The quantity of blood pumped with each beat of the heart.
- 41. The blood pressure after the contraction of the heart while the chambers of the heart refill with blood.
- 42. The membranous structures in an artery or vein, that fold or close to prevent the return flow of the body fluid passing through them.
- 43. A valve that prevents the backflow of blood from an artery into a ventricle.
Down
- 1. A lymphoid organ situated in the neck of vertebrates that produces T cells for the immune system.
- 2. The part of the nervous system that controls the motor nerves that regulate equilibrium, and that is not under conscious control.
- 3. Area of the brain that coordinates many nerve and hormone functions.
- 4. The system of blood vessels that carries deoxygenated blood to the lungs and oxygenated blood back to the heart.
- 6. The amount of blood pumped from the heart each minute.
- 8. The thickening and hardening of the walls of the arteries, occurring typically in old age.
- 9. The fluid found in lymph vessels that contains some proteins that have leaked through capillary walls.
- 10. A bulge in the weakened wall of a blood vessel, usually an artery.
- 11. A muscular, thick-walled chamber of the heart that delivers blood to the arteries.
- 12. blood cells A colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease.
- 14. A nerve fiber that branches and carries electrical impulses throughout the ventricles.
- 18. The blood pressure during the contraction of the left ventricle of the heart.
- 19. The fluid portion of the blood.
- 23. A division of the autonomic nervous system that prepares the body for stress.
- 24. A vein carrying oxygenated blood from the lungs to the left atrium of the heart.
- 25. A blood vessel that carries blood towards the heart.
- 27. The artery carrying blood from the right ventricle of the heart to the lungs for oxygenation.
- 28. A degeneration of blood vessels caused by the accumulation of fat deposits in the inner wall.
- 30. Disc shaped cells that impart the red color to blood, contain hemoglobin, and transport oxygen and carbon dioxide to and from tissues.
- 31. The largest artery in the body; carries oxygenated blood to the tissues.
- 33. An artery that supplies the cardiac muscle with oxygen and nutrients.
- 35. The selective movement of materials through capillary walls by a pressure gradient.
- 38. A wall of muscle that separates the right and left sides of the heart.
- 40. A large vein carrying deoxygenated blood into the heart. Two in humans; the inferior vena cava (carrying blood from the lower body), and the superior vena cava (carrying blood from the head, arms, and upper body).