Hormones in animals are chemical messengers produced by endocrine glands that help in controlling and coordinating various body functions. Unlike the nervous system, which acts quickly through electrical impulses, the endocrine system works more slowly but has long-lasting effects. Hormones are released directly into the bloodstream and travel to target organs where they regulate activities such as growth, metabolism, reproduction, and mood.  
  
The human endocrine system consists of several important glands. The pituitary gland is known as the “master gland” because it controls the functioning of other endocrine glands. The thyroid gland secretes thyroxine, which regulates metabolism and energy balance. The adrenal glands produce hormones like adrenaline that prepare the body for emergencies (fight or flight response). The pancreas secretes insulin, which controls blood sugar levels. The reproductive glands (testes and ovaries) produce sex hormones responsible for secondary sexual characteristics and reproduction.  
  
Proper coordination between hormones is essential for maintaining balance in the body. Any imbalance in hormone levels can lead to disorders such as diabetes or growth-related problems.  
  
Thus, hormones play a vital role in regulating body functions and ensuring smooth coordination in animals.

NCERT | Class 10 | Chapter 6 | Control and Coordination | Hormones in Animals Part 4