Structure of the Human Body

• External Structure: The body consists of a head, neck, torso (including the thorax and abdomen), arms, hands, legs, and feet.
• Internal Structure: This includes organs (like the heart, lungs, and liver), bones, muscles, blood vessels, and connective tissues.

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Major Organ Systems

1. Skeletal System: Provides structure, support, and protection for internal organs; consists of bones and joints.
2. Muscular System: Enables movement through skeletal muscles and maintains posture.
3. Cardiovascular System: Comprises the heart and blood vessels, responsible for transporting blood, nutrients, and oxygen throughout the body.
4. Respiratory System: Facilitates gas exchange, providing oxygen to the body and removing carbon dioxide.
5. Digestive System: Breaks down food into nutrients for energy and growth, involving organs like the stomach and intestines.
6. Nervous System: Controls body functions and responses through the brain, spinal cord, and nerves.
7. Endocrine System: Regulates bodily functions through hormones produced by glands such as the thyroid and adrenal glands.
8. Immune/Lymphatic System: Defends against pathogens and maintains fluid balance in the body.
9. Urinary System: Eliminates waste products and regulates water and electrolyte balance through the kidneys and bladder.
10. Integumentary System: Protects the body from external damage; includes skin, hair, and nails.
11. Male and Female Reproductive Systems: Responsible for producing gametes and hormones, facilitating reproduction.

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Composition of the Human Body

Conclusion