As far as I know, the adrenal glands, when submitted under pressure such as the one described in the example, secrete a substance known as epinephrine which has the tendency of increasing the affected person's heart rate and breathing.
Answer:

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Dyad is the word to match your description
Skeletal muscle – the specialised tissue that is attached to bones and allows movement. Together, skeletal muscles and bones are called the musculoskeletal system (also known as the locomotor system).
Answer: false
Explanation: External threats are not intentional.
Companies face business risks every day, and those risks are part of every organisation which can be in form of
--- External threats (economic, social , political and Micro threats )are threats or risk that cannot be controlled by a company or predicted with a high level of reliability. Therefore, making it difficult to reduce the associated risks.
-And Internal threats are threats that happen inside the organisations which can be predicted with some reliability, and therefore, provide chances of reducing it.
They both can lead to lower revenue, profits, and financial loss.