7. Which of the following organ : system combinations are correct?
Cardiovascular: heart, blood and blood vessels.
Endocrine: hormones, pituitary gland, lymph nodes
Urinary: kidneys, arteries and urethra
Respiratory: lungs, pharynx and esophagus
Skeletal: bones, cartilage, and ligaments
Digestive: teeth, tongue, and intestines.
Cardiovascular, skeletal and digestive systesm are matched correctly. Look carefully at the others.