Fill in the blank.The recessed area in the kidney, where the renal vein, renal artery, and ureter enter, is known as the _______________.

MCQs on the structure of the human body at the cellular, tissue, organ, and organ system levels. Topics include: the integumentary, skeletal, muscular, nervous, cardiovascular, lymphatic, respiratory, digestive, urinary, endocrine, and reproductive systems.