Question

write the term that best fits each description.

1. vessels that carry blood away from the heart
2. vessels that carry blood toward the heart
3. tiny blood vessels with walls that are only one cell thick
4. thick wall that divides the heart into two sides
5. upper chambers of the heart that receive blood
6. lower chambers of the heart that pump blood out of the heart
7. valve between right atrium and right ventricle
8. valve between left atrium and left ventricle
9. valves found between the ventricles and blood vessels
10. membrane around the heart
11. the only artery in the body rich in carbon dioxide
12. the only vein in the body rich in oxygen

Explanation:

• Arteries: By definition, they carry blood away from the heart.
• Veins: Their function is to carry blood toward the heart.
• Capillaries: Have extremely thin walls (one - cell thick) for efficient gas and nutrient exchange.
• Septum: Physically divides the heart into left and right sides.
• Atria: The upper chambers that receive blood (e.g., right atrium receives de - oxygenated blood from the body, left atrium receives oxygenated blood from the lungs).
• Ventricles: The lower, more muscular chambers that pump blood out of the heart (right ventricle pumps to the lungs, left ventricle pumps to the rest of the body).
• Tricuspid valve: Located between the right atrium and right ventricle to prevent back - flow.
• Bicuspid (Mitral) valve: Between the left atrium and left ventricle for the same anti - backflow purpose.
• Semilunar valves: (Aortic and pulmonary valves) are between ventricles and major blood vessels (aorta and pulmonary artery) to prevent blood from flowing back into the ventricles.
• Pericardium: The membranous sac that encloses the heart.
• Pulmonary artery: Carries de - oxygenated blood from the right ventricle to the lungs (unlike most arteries which carry oxygenated blood).
• Pulmonary vein: Carries oxygenated blood from the lungs to the left atrium (unlike most veins which carry de - oxygenated blood)

Answer:

1. Arteries
2. Veins
3. Capillaries
4. Septum
5. Atria
6. Ventricles
7. Tricuspid valve
8. Bicuspid (Mitral) valve
9. Semilunar valves
10. Pericardium
11. Pulmonary artery
12. Pulmonary vein