Across
- 2. System of bones, cartilages, and ligaments that provides support and protection to the body and allows movement.
- 8. An organ located in the abdomen that filters blood, stores blood cells, and plays a role in the immune system.
- 9. The vein that carries oxygenated blood from the lungs to the heart.
- 16. The rhythmic expansion and contraction of arteries as blood is pumped through them.
- 18. The number of heartbeats per minute.
- 20. Organelles responsible for producing energy in the form of ATP through cellular respiration.
- 23. One of the two lower chambers of the heart that pump blood out to the arteries.
- 24. The double-layered membrane surrounding the heart.
- 26. The ability of an organism to maintain internal stability despite external changes.
- 32. Blood vessels that supply oxygen-rich blood to the heart muscle.
- 36. System responsible for breaking down food and absorbing nutrients.
- 38. 12 pairs of nerves that arise directly from the brain and control various sensory and motor functions of the head, neck, and organs.
- 43. The study of the functions and processes of living organisms.
- 45. Abnormal heart rhythm.
- 48. Blood vessels that carry deoxygenated blood back to the heart.
- 49. Blood vessels that carry oxygenated blood away from the heart.
- 50. System responsible for producing offspring.
- 51. Circulation of blood within the heart muscle itself.
- 52. Another term for the cardiovascular system, referring specifically to the circulation of blood.
- 53. System of the heart and blood vessels responsible for circulating blood throughout the body.
- 54. The inner lining of the heart chambers and valves.
- 55. The artery that carries deoxygenated blood from the heart to the lungs.
Down
- 1. Tiny air sacs in the lungs where gas exchange (oxygen and carbon dioxide) occurs.
- 3. Chemical messengers secreted by glands in the endocrine system, regulating various bodily functions.
- 4. The force exerted by circulating blood against the walls of blood vessels.
- 5. The phase of the cardiac cycle when the heart muscle contracts, pumping blood.
- 6. System responsible for breathing, including the lungs and airways.
- 7. Circulation of blood throughout the body, excluding the heart and lungs.
- 10. One of the two upper chambers of the heart that receive blood from the veins.
- 11. System of nerves and specialized cells that transmit signals between different parts of the body.
- 12. Structures within the heart that prevent backflow of blood.
- 13. The wall of tissue that separates the left and right sides of the heart.
- 14. The sequence of events that occur during one heartbeat.
- 15. The main artery of the body, originating from the left ventricle of the heart.
- 17. A test that records the electrical activity of the heart.
- 19. The phase of the cardiac cycle when the heart muscle relaxes and fills with blood.
- 21. The study of the structure and organization of living organisms.
- 22. A group of cells with similar structure and function.
- 25. A structure composed of multiple tissues working together to perform specific functions.
- 27. The muscular layer of the heart responsible for its pumping action.
- 28. A structural abnormality of the heart present at birth.
- 29. Tiny blood vessels that connect arteries and veins, allowing for the exchange of nutrients and waste products.
- 30. The buildup of plaque in the arteries, narrowing them and restricting blood flow.
- 31. System of glands that secrete hormones regulating various bodily functions.
- 32. The basic structural and functional unit of all living organisms.
- 33. The volume of blood ejected from the heart with each contraction.
- 34. A muscular organ responsible for pumping blood throughout the body.
- 35. A sudden blockage of blood flow to the heart muscle.
- 37. System consisting of the skin, hair, and nails, providing protection and regulating temperature.
- 39. System of lymph nodes, vessels, and organs involved in immune response and fluid balance.
- 40. Endocrine glands located on top of the kidneys that produce hormones such as adrenaline and cortisol.
- 41. The volume of blood pumped by the heart in one minute.
- 42. The inability of the heart to pump enough blood to meet the body's needs.
- 44. System responsible for filtering blood and producing urine.
- 46. Small, bean-shaped structures distributed throughout the body that filter lymph and contain immune cells.
- 47. System of muscles that enables movement and supports the structure of the body.