Examlex
In a study of the effects of different types of soil on plant growth, which of these would be the variable?
Capillaries
Capillaries are the smallest blood vessels in the body, connecting arterioles and venules, and are responsible for the exchange of oxygen, carbon dioxide, and other nutrients and waste products between blood and tissues.
Arteries
Blood vessels that carry oxygen-rich blood away from the heart to the body's tissues.
Veins
Blood vessels that carry blood toward the heart, usually deoxygenated, except for the pulmonary and umbilical veins.
Aortic Arch
The part of the aorta that bends between the ascending and descending aorta, serving as a crucial pathway for blood from the heart to the body.
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