Across
- 4. The smallest blood vessels in the body, where the exchange of oxygen, nutrients, and waste products occurs with body tissues.
- 7. The protective membrane surrounding the heart that helps reduce friction during heartbeats.
- 8. Also known as the windpipe, it is a tube that connects the larynx to the lungs, allowing air to pass through during respiration.
- 10. Blood vessels that carry oxygenated blood from the lungs back to the heart.
- 14. The set of organs and structures involved in the process of respiration, including the lungs, airways, and diaphragm.
- 15. A dome-shaped muscle beneath the lungs that aids in the process of breathing by contracting and relaxing.
- 18. The sequence of events that occur during one complete heartbeat, involving the contraction and relaxation of the heart chambers.
- 20. The two lower chambers of the heart that receive blood from the atria and pump it out to the lungs and the body.
- 21. Also known as the voice box, it houses the vocal cords and plays a role in producing sound during speech.
- 22. An organ involved in filtering and storing blood, as well as producing certain immune cells.
- 24. One of the two upper chambers of the heart, where blood is received before being pumped to the ventricles.
- 25. A protein found in red blood cells that binds to oxygen and helps transport it from the lungs to the body's tissues.
- 28. The part of the circulatory system that carries deoxygenated blood from the heart to the lungs for oxygenation and returns oxygenated blood back to the heart.
- 29. The hollow space behind the nose where air is warmed, moistened, and filtered before entering the respiratory system.
- 30. A waste gas produced by cells during metabolism, which is transported to the lungs and expelled during respiration.
Down
- 1. Blood vessels that carry deoxygenated blood back to the heart from various parts of the body.
- 2. A muscular organ responsible for pumping blood throughout the circulatory system, supplying oxygen and nutrients to the body's tissues.
- 3. Tiny air sacs in the lungs where oxygen is taken up and carbon dioxide is released during the process of respiration.
- 5. The muscular middle layer of the heart responsible for contracting and pumping blood.
- 6. Blood cells responsible for carrying oxygen to tissues and removing carbon dioxide, containing hemoglobin to facilitate gas exchange.
- 9. The force exerted by circulating blood against the walls of the blood vessels, with systolic pressure representing the heart's contraction and diastolic pressure representing the heart's relaxation.
- 11. The throat region that connects the nasal and oral cavities to the larynx, serving as a passage for both air and food.
- 12. The primary organs of the respiratory system where oxygen is taken in and carbon dioxide is expelled.
- 13. Small blood vessels that collect blood from capillaries and carry it toward larger veins.
- 16. The main airways branching off from the trachea that further divide into smaller bronchioles, leading to the lungs.
- 17. Blood vessels that carry oxygenated blood away from the heart and distribute it to various parts of the body.
- 19. Small cell fragments in the blood that help with blood clotting and wound healing.
- 23. The part of the circulatory system that delivers oxygenated blood from the heart to the body's tissues and returns deoxygenated blood back to the heart.
- 26. A vital gas that is inhaled during respiration and necessary for the body's energy production.
- 27. A vital fluid that transports oxygen, nutrients, hormones, and waste products throughout the body.