Heart rate, blood pressure, and blood sugar levels are increased in times of emergency by
a) the parasympathetic nervous system.
b) stress hormones.
c) the immune system.
d) glucose.

The correct answer is -

B) stress hormones.

Explanation:

Emergency situations can be caused by any Emotional or physical stress that may include anxiety, fear, anger, tension and other physiological stress such as injury, infection etc.

These situations lead to the activation of sympathetic nervous system, which ultimately causes the secretion of stress hormones (such as cortisol, which is primary stress hormone) from adrenal gland in bloodstream.

As a consequence, blood pressure, heart rate, and blood sugar level of the person rises.

Thus, option B) is the right answer.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.