Skeletal System The body’s framework, made up of 206 bones. Key structures include the skull, spine, ribcage, and limb bones. Bones provide support, protect organs, and enable movement.
Muscular System Over 600 muscles attach to bones via tendons, allowing movement. The heart (cardiac muscle) and digestive tract (smooth muscle) operate involuntarily.
Cardiovascular System The heart pumps blood through a vast network of arteries, veins, and capillaries, delivering oxygen and nutrients throughout the body.
Respiratory System The lungs, trachea, and diaphragm work together to bring in oxygen and expel carbon dioxide through breathing.
Nervous System The brain and spinal cord (central nervous system) process information, while peripheral nerves carry signals to and from the rest of the body.
Digestive System From the mouth through the stomach, small intestine, and large intestine, food is broken down and nutrients are absorbed.
Endocrine System Glands like the thyroid, adrenal glands, and pancreas release hormones that regulate metabolism, growth, and mood.
Integumentary System The skin, hair, and nails form the body’s outer protective barrier and help regulate temperature.
Together, these systems work in constant coordination to keep the body functioning. Would you like to dive deeper into any particular system?
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