When you feel threatened, your nervous system responds by releasing a flood of stress hormones, including adrenaline and cortisol, which rouse the body for emergency action. Your heart pounds faster, muscles tighten, blood pressure rises, breath quickens, and your senses become sharper. which is called the fight or flight response
The answer is letter C.
<span>
Muscles directly cause the movement of limbs in
the body. These are mostly made up of striated tissues that slide along each
other causing the movement of the whole body. These tissues are attached to the
bones that make up the skeletal system. They provide the structure and frame of
the body and they also serve as cushions and protection for the bones. Without
muscles movement will not be possible and we would seem like hollow structures
only made up of bones.</span>
There are many different systems involved in when we exercise, the three main ones are the Respiratory system which is involved in breathing the circulatory system which is about circulation of blood around the body and finally the muscular system and finally the Muscular system which is about how we move.
Explanation:
edg2021
C is your answer!! Mark brainliest please ❤️❤️❤️