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HUMAN BODY SYSTEM, image - Coggle Diagram
HUMAN BODY SYSTEM
Nervous 
Brain: The brain is the central organ of the nervous system and is responsible for processing information received from the sensory organs and sending instructions to the body's muscles and organs.
Spinal Cord: The spinal cord is a long, thin, tubular bundle of nervous tissue that extends from the base of the brain down the back. It serves as a pathway for nerve impulses to travel to and from the brain and the peripheral nervous system.
Peripheral Nerves: These are the nerves outside the brain and spinal cord that connect them to the rest of the body. They transmit sensory information from the body to the central nervous system and carry motor commands from the central nervous system to the muscles and glands.
Cells
Neurons: Neurons are specialized cells that transmit nerve impulses. They are the basic building blocks of the nervous system and are responsible for transmitting electrical and chemical signals throughout the body.
Red Blood Cells (Erythrocytes): Red blood cells are responsible for transporting oxygen from the lungs to the rest of the body and carbon dioxide from the body to the lungs for exhalation.
Epithelial Cells: Epithelial cells form the linings and surfaces of various organs and structures in the body, including the skin, respiratory tract, gastrointestinal tract, and blood vessels.
Systems
Circulatory system: This system includes the heart, blood vessels, and blood. It transports oxygen, nutrients, hormones, and waste products throughout the body.
Respiratory system: Comprising the lungs, airways, and respiratory muscles, this system facilitates the exchange of oxygen and carbon dioxide between the body and the environment, supporting cellular respiration.
Muscular system: Made up of muscles and tendons, this system enables movement, provides support and stability to the body, and helps maintain posture. It also plays a role in functions like digestion and circulation through muscle contractions.
Tissues
Muscle Tissue: Muscle tissue is responsible for movement in the body. There are three types of muscle tissue: skeletal muscle, which is attached to bones and allows for voluntary movement;
Epithelial Tissue: Epithelial tissue covers the surfaces of the body, lines cavities and organs, and forms glands. It serves as a protective barrier, regulates the passage of materials, and can be specialized for functions such as secretion and absorption.
Connective Tissue: Connective tissue provides support, structure, and protection to the body and its organs. It consists of cells dispersed within an extracellular matrix containing protein fibers such as collagen and elastin.
Organs
Liver: The liver is a vital organ involved in numerous metabolic processes, including detoxification of harmful substances, synthesis of proteins, and production of bile for digestion.
Lungs: The lungs are a pair of respiratory organs responsible for exchanging oxygen and carbon dioxide between the blood and the air. They facilitate the process of breathing and are essential for the body's oxygen supply.
Heart: The heart is a muscular organ responsible for pumping blood throughout the body, delivering oxygen and nutrients to tissues and removing waste products.
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