How is blood involved in the endocrine and immune system?

Explanation:

When it comes to endocrine system and blood relationship, it regulates how much of a hormone is secreted. It varies from situation to situation as blood already depends on how much there are hormones in blood or concentration of any other substance in the blood. There are numerous factors that affect hormone level in blood, like stressing too much, certain diseases and infections, as well as changes in minerals and other substances in blood,

Immune system and blood are also in a very important relationship, as immune system includes white blood cells. There are also found many different substances like chemicals and proteins, like anti bodies and interferon. Some of the mentioned terms have a role to immediately protect immune system by attacking foreign things in our bodies, like bacteria, viruses, many diseases, infections and others.

answer: because barriers look like ball

explanation: there round and blue like my ball