Which of the following is an example of negative feedback in the endocrine system?

a. when the amount of a hormone reaches a certain level, the endocrine system stops releasing that hormone.
b. when a hormone travels through the bloodstream, it will interact only with its target cells.
c. after age 40 or so, people’s muscle strength begins to decrease and their skin starts to wrinkle.
d. when people are startled by a frightening event, their hearts beat faster and their breathing increases.

At 2: 00 am, a 17-year-old boy, accompanied by his 19-year-old girlfriend, had driven to the bar to give his father (who had been drinking large amounts of alcohol) a ride home. on the way back, they were involved in a motor vehicle collision. the boy has a large laceration with profuse bleeding on his forehead. his girlfriend is unconscious in the front passenger floor. the father is standing outside the vehicle, appearing heavily intoxicated, and is refusing care. what is the best way to gain consent to begin care when his father has an altered mental status or is unconscious? a. phone his mother for consent. b. call his grandparents for consent. c. it is a true emergency, so consent is implied. d. you are covered under the good samaritan laws.