Organs and Systems of the Human Body - Lesson 3
ORGANS: Organs are the structures that are composed of several kinds of tissues. For instance an organ like Stomach is composed of Glandular epithelial tissue, nerve tissue and muscle tissue.
SYSTEMS: A system consists of organ groups functioning together to perform a complex function. For example digestive system consists of organs like mouth, esophagus, stomach and small and large intestines, they combine together to do a complex function of digesting food and absorb the digested food into the bloodstream.
In our body there are ten systems as below:
1. Skin and sense organs-This system contains skin, hair, nails, sweat glands, oil glands, the eye, the ear, the nose, and the tongue.
2. Skeletal system-joints and bones.
3. Muscular system-muscles.
4. Circulatory system-heart, blood vessels (arteries, veins and capillaries), Lymph vessels and nodes, Spleen and thymus gland.
5. Nervous system-brain, spinal cord, nerves and collection of nerves.
6. Endocrine system-thyroid gland (neck), pituitary gland (base of the brain), sex glands (ovaries and testes), adrenal glands, pancreas, thymus gland, and parathyroid glands.
7. Reproductive system-male: testes and the tubes associated with it, urethra, penis and prostate gland. Female: ovaries, uterine or fallopian tubes, uterus or womb, vagina and mammary glands.
8. Respiratory system-Nose, pharynx, larynx or voice box, trachea or windpipe, bronchial tubes, and lungs.
9. Urinary or excretory system-kidneys, ureters (tubes from the kidneys to the urinary bladder), urinary bladder, urethra (tube from the bladder to the outside of the body).
10. Digestive system-Mouth, pharynx or throat, esophagus, stomach, small and large intestines, liver, pancreas, and gallbladder.
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