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Meta Description  Learn about hormones in humans, their endocrine glands, functions, and role in coordination for Cambridge IGCSE Biology exams. Introduction Hormones are chemical messengers that control many processes in the human body. While the nervous system acts fast and short-term, hormones act slower but have long-lasting effects , helping maintain homeostasis . In this blog, we will cover: What hormones are Major endocrine glands and their hormones Examples like adrenaline, insulin, and glucagon How hormones control body functions (IGCSE 0970 syllabus) What Are Hormones? Hormones are chemicals produced by endocrine glands and released into the bloodstream . They travel to target organs and trigger specific responses. Key Points: Travel in blood to target organs Act in small amounts Usually slower than nervous signals but longer-lasting Help maintain internal balance (homeostasis) 📌 Example: Insulin regulates blood glucose; adrenaline prepares the body for stress. Maj...

1. Nervous system: Manages communication and control throughout the body. It is divided into the central nervous system (brain and spinal cord) and the peripheral nervous system (nerve networks). 2. Circulatory system: Responsible for transporting blood, oxygen, nutrients, and waste products throughout your body. It consists of the heart, blood vessels, and blood. 3. Respiratory system: Facilitates gas exchange, primarily oxygen intake and carbon dioxide expulsion. Key components include the lungs, trachea, bronchi, and diaphragm. 4. Digestive system: Breaks down food into nutrients and energy the body can use. Major components include the mouth, esophagus, stomach, small and large intestines, and accessory organs like the liver, pancreas, and gallbladder. 5. Muscular system: Enables movement, maintains posture, and produces heat. It consists of three types of muscles: skeletal, smooth, and cardiac. 6. Skeletal system: Provides structural support and protection for internal organs. It ...