PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
the parasympathetic NS responds
|
|
|
the sympathetic NS responds
|
|
|
pupils constrict
|
|
|
the sympathetic NS responds and causes pupils to constrict
|
Detailed explanation-1: -Activation of the sympathetic nervous system in this manner triggers an acute stress response called the “fight or flight” response. This enables a person to either fight the threat or flee the situation.
Detailed explanation-2: -The sympathetic nervous systems stimulate the adrenal glands triggering the release of catecholamines, which include adrenaline and noradrenaline. This results in an increase in heart rate, blood pressure, and breathing rate.
Detailed explanation-3: -In the heart (beta-1, beta-2), sympathetic activation causes an increased heart rate, the force of contraction, and rate of conduction, allowing for increased cardiac output to supply the body with oxygenated blood.
Detailed explanation-4: -The alarm reaction stage of general adaptation syndrome is the body’s initial response to stress. The sympathetic nervous system is activated by the sudden release of hormones. You may better know this stage as the fight-or-flight response.