Across
- 1. Beat of the heart
- 4. space within a tubular part or organ, such as the space within a blood vessel
- 6. The middle and thickest layer of tissue of a blood vessel wall
- 10. transports mineral nutrients up from the roots
- 11. A hollow, muscular organ that pumps blood throughout the body.
- 12. backflow or ejecting of contents through an opening
- 13. flat, leaf-shaped structures that comprise the valves of the heart
- 14. vessels that carry blood back to the heart
Down
- 2. Circular muscles that encircle and, by contracting, constrict a duct
- 3. Membrane surrounding the heart
- 5. A liquid's resistance to flowing
- 7. carry blood away from the heart
- 8. Reduces blood flow.
- 9. Flaps of tissue that open and close