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1 _ vena cava 2 _ atrium 3 _valve 4 _pulmonary 5 _artery 6 _capillary 7 _ ventricle
A. a small tube that lets blood and tissue exchange nutrients
B. one of the two upper chambers of the heart
C. one of the two major veins that carries blood to the heart
D. relating to the lungs
E. a tube that carries blood from the heart to the body
F. a structure in the heart that opens and closes
G. a space in the heart that holds blood

1. Capillary (A) - A small tube that lets blood and tissue exchange nutrients: Capillaries are the smallest blood vessels in our body. They have thin walls that allow the exchange of nutrients, oxygen, and waste products between the blood and tissues.

2. Atrium (B) - One of the two upper chambers of the heart: The heart is divided into four chambers - two atria and two ventricles. The atria receive blood returning to the heart from the body and lungs.

3. Vena cava (C) - One of the two major veins that carries blood to the heart: The superior vena cava brings deoxygenated blood from the upper body to the right atrium of the heart, while the inferior vena cava carries deoxygenated blood from the lower body to the right atrium.

4. Pulmonary (D) - Relating to the lungs: The pulmonary arteries and veins are the blood vessels that connect the heart to the lungs. The pulmonary arteries carry deoxygenated blood from the heart to the lungs, while the pulmonary veins bring oxygenated blood from the lungs back to the heart.

5. Artery (E) - A tube that carries blood from the heart to the body: Arteries are large blood vessels that carry oxygenated blood away from the heart to the various parts of the body.

6. Valve (F) - A structure in the heart that opens and closes: Valves in the heart ensure that blood moves in only one direction. They prevent blood from flowing backward. There are four valves in the heart - two atrioventricular valves (tricuspid valve and mitral valve) and two semilunar valves (pulmonary valve and aortic valve).

7. Ventricle (G) - A space in the heart that holds blood: The ventricles are the two lower chambers of the heart. They pump blood out of the heart - the right ventricle pumps blood to the lungs, and the left ventricle pumps oxygenated blood to the rest of the body.

Hope this helps! Let me know if you have any more questions.