Hormone adrenaline increases which of the following?

(a) Blood pressure

(b) Blood calcium

(c) Blood glucose 

(d) Blood glycogen

Select the correct option.

• Adrenaline causes blood vessels to constrict, particularly in the skin, digestive system, and kidneys. This constriction redirects blood flow to vital organs like the heart, lungs, and muscles, increasing blood pressure. 
• Adrenaline stimulates the liver to release stored glucose into the bloodstream. It also reduces the uptake of glucose by muscle and fat cells. This process, known as glycogenolysis, contributes to an increase in blood glucose levels.

Both these are a part of the "fight or flight" reaction, helping to prepare the body for intense physical activity or stress.