Question

Assertion: Adrenaline is called an emergency hormone.
Reason: It acts on the cells of skeletal, cardiac, smooth muscles, blood vessels and fat cells.

Answer 1

Hint: A gaggle of endocrine glands which produces various hormones is called the endocrine system. It is also named as a hormonal system.
The system helps in coordinating the activities of our body. It consists of many glands which store and release chemicals called hormones. These hormones act as the messengers between the nervous system and the organs of our body.

Complete Answer-
On the top of each kidney there are two adrenal glands which make adrenaline hormones. The adrenaline hormones prepare our body to function at maximum efficiency during emergency situations like danger, excitement, frightened ness, anger, etc. This happens as follows:
When we are faced with a dangerous situation then the over nervous system stimulates the gland to secrete the more adrenaline hormone into our blood. It increases our breathing rate, blood flow, heart beats and produces a lot of energy to fight or flight (runner).
Adrenal glands are also called glands of emergency. So, the adrenaline hormone is known as an emergency hormone. A lot of adrenaline hormones are secreted when we are angry or excited and thus, the rapid output of energy helps us to cope with emotional situations. So, the assertion is correct.
The hormones are secreted by a specific gland but acts on other parts of the body.

So, reason is also correct but not the correct explanation of the assertion.

NOTE-
The main centres in the body for the coordination of the systems of control are hypothalamus and pituitary glands.
Some of the glands in our body have both endocrine and exocrine functions. The hormones act on specific tissues or organs called target organs.
The effect of message through the messenger chemicals (hormones) lasts longer and travels very slowly through our blood stream.