While hiking in the mountains of Alaska, Pete encountered a giant grizzly bear. He immediately felt his heart rate increase, his breathing become rapid, and sweat drip down his back. These events were most likely due to the effects of the neurotransmitter called ______________ in his body.

Epinephrine, which is also referred to as adrenaline, is the active sympathetic hormone that is secreted by the medulla of the adrenal glands into the bloodstream to initiate the body’s fight-or-flight response to stress or threat, causing increased blood pressure, sugar metabolism, heart rate, breathe rate, muscle strength as well as sweat. Pete's sighting of a bear as a threat stimulates the sympathetic nervous system to initiate the secretion of epinephrine which brings about the fight-or-flight response of the body to increase alertness of the body.

tochinwachukwu33 tochinwachukwu33 · Answer 2 · 2025-03-25T04:23:20-04:00

Answer:

Epinephrine (adrenaline)

Explanation:

Epinephrine also known as adrenaline, is secreted by the adrenal gland in the medulla oblongata portion of the (hind brain). Epinephrine is usually released when the body needs to raise the glucose levels of the blood, and increase the cardiac output of the heart. It usually occurs when the body senses that it is being threatened. It prepares itself to either flee the scene, or to stand and fight.

Most times, when epinephrine is secreted, the survival instincts are activated, and pain is masked. Pete's body was simply preparing itself to take swift and quick action to protect itself against the bear.