Hormones stimulating the anterior pituitary gland are secreted by: Question 8 Which among the following both a neurotransmitter and a hormone? Question 9 Which of the following is NOT characteristic of steroid hormones? Question 10 The first structure to vibrate in response to sounds is the Question 11 The primary visual area in brain is. Question 12 Which of the following structures secrete the aqueous humor into the anterior chamber.