Which hormone secreted by posterior pituitary causes uterine contractions and milk-letdown: Question 18 The auditory tube acts to equalize pressure between the middle ear and Question 19 The middle ear bone (ossicle) that lies next to the tympanum is: Question 20 The photoreceptor structures that allow vision in dim light are: Question 21 The fluid that transmits sound waves much like ripples in water in the inner ear is: Question 22 This gland is also called the master endocrine gland: Question 23 Which hormone would you give to a person with dangerously low blood glucose levels? Question 24 The hypothalamus

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