In a collision, a force acts upon an object for a given amount of time to change the object's velocity. The product of force and time is known as impulse. The product of mass â¦ and velocity change is known as momentum change. In a collision the impulse encountered by an object is equal to the momentum change it experiences.Impulse = Momentum Change.
In addition to the locus coeruleus existing as a source of the neurotransmitter norepinephrine within the central nervous system, the adrenal gland can also release norepinephrine during a stress response into the bodyâs blood stream, at which point norepinephrine acts as a hormone in the endocrine system.
How stress affects brain performance. Stress hormones affect our memory and cognition. When we get upset, our cortisol levels elevate in the blood, and the part of our brain in which learning and memory resides -- the hippocampus -- starts dumping neurons as a reaction to stress. By getting smaller, our hippocampus negatively impacts our memory and learning capacity.