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The Human Body

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A series of free High School Biology Video Lessons.

The structure and function of nerve cells, reproductive system, respiratory system, Circulatory System, and Immune System.

Neurons are cells of the nervous system that send signals. Neurons are classified by function (sensory, motor or interneurons), by structure (multipolar, bipolar or unipolar) and by neuron communication (active potential or neurotransmitter).
The structure and function of nerve cells.
Reproductive System
The reproductive system is a group of organs responsible for reproduction. The organs and gametes of the reproductive system differs between genders- female gametes are called eggs and male gametes are called sperm. The reproductive system is also where offspring are fertilized.
The structure and function of the reproductive system.

Respiratory System
The intake of oxygen into the lungs and producing carbon dioxide in return is the main function of the respiratory system. The respiratory system includes airways, lungs and respiratory muscles. When oxygen is breathed in, it enters the circulatory system through the lungs by the process of diffusion.
The structure and function of the respiratory system.
Circulatory System
The circulatory system transports nutrients and blood cells to and from cells throughout the body. Blood is oxygenated in the lungs then sent back to the heart to be pumped to the rest of the body in blood vessels. The types of blood vessels include veins, arteries and capillaries. Veins carry blood to the heart while arteries carry blood away from the heart. Oxygen diffuses into the cells directly from the capillaries.
The structure and function of the circulatory system.

Immune System
The immune system protects the body from diseases. It detects and kills things like viruses and bacteria to prevent sickness and to allow the body to continue to function properly. There are three lines of defense which protect the body. The first line is eternal (skin, mucous, tears). The second line involves phagocytosis, which is the ingestion of invading organisms by white blood cells. The third type is specific immunity in which white blood cells recognize previously encountered organisms.
The structure and function of the immune system.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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