Pine trees are all evergreens and possess needles as leaves and cones as part of their reproductive system. All pines are resinous Coniferous trees. Some Pine species grow as shrubs instead of trees.
How Fear Works. To produce the fight-or-flight response, the hypothalamus activates two systems: the sympathetic nervous system and the adrenal-cortical system. The sympathetic nervous system uses nerve pathways to initiate reactions in the body, and the adrenal-cortical system uses the bloodstream. The combined effects of these two systems are the fight-or-flight response. When the hypothalamus tells the sympathetic nervous system to kick into gear, the overall effect is that the body speeds up, tenses up and becomes generally very alert. If there's a burglar at the door, you're going to have to take action -- and fast.
adrenal glands. This document is available in Spanish. What do the adrenal glands do? The medulla is located in the center of the gland and makes adrenalineAdrenaline - the hormone that helps control the fight or flight response and puts the body on high alert (also known as epinephrine) and noradrenaline. These hormones are also known as epinephrine and norepinephrine. These hormones control the fight or flight response i.e. put your body on high alert.. These hormones increase the heart rate, increase blood pressure, increase the amount of oxygen you breathe in, and temporarily improve the eyesight.