Final answer:
The sympathetic nervous system is responsible for the fight-or-flight response. It increases heart rate and releases adrenaline to prepare the body for action. option d is answer
Step-by-step explanation:
The sympathetic nervous system is part of the autonomic nervous system and is responsible for the fight-or-flight response. When faced with a threat or danger, the sympathetic system prepares the body for action by increasing heart rate, dilating the pupils, and releasing stress hormones like adrenaline. This heightened state of arousal helps in survival situations.
Adrenaline, also known as epinephrine, brings about two changes to help the skeletal muscle response: it increases blood flow to the skeletal muscles and it mobilizes glucose to provide extra energy for muscle contraction. option d is answer