The pulmonary veins are the only veins in the body that carry oxygenated blood. They transport oxygen-rich blood from the lungs back to the left atrium of the heart. In contrast, the pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. All other veins carry deoxygenated blood and arteries carry oxygenated blood.
Explanation:
Trypsin, a pancreatic protease, hydrolyzes proteins into peptides in the small intestine. It is secreted as inactive trypsinogen and activated by enterokinase.
Explanation:
The hepatic portal system directs nutrient-rich blood from intestines to liver. Blood pressure is highest in arteries; fish have two-chambered heart; foramen ovale is a fetal structure that closes after birth.
Explanation:
Glucose (C₆H₁₂O₆) is a simple sugar (monosaccharide), the primary fuel for cells. Sucrose (glucose+fructose), lactose (glucose+galactose), and maltose (glucose+glucose) are disaccharides. Fructose and galactose are also monosaccharides. Monosaccharides are the building blocks of complex carbohydrates.
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