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first something must occur, a change in the external environment (and more rarely within the body). This is known as a stimulus.This stimulus will be picked up or "recepted" by a receptor.The re...

When you breath in, the intercostal muscles and diaphragm contract. This causes the diaphragm to flatten and the ribs to move apart which increases the size of the chest cavity. The larger volume now mean...

1- Prophase2- Metaphase3- Anaphase4- Telophase

Cytoplasm: A jelly-like material that contains dissolved nutrients and salts and structures called organelles. It is where many of the chemical reactions happen.Nucleus: Contains genetic material, includi...

Our body's immune system is responsible for preventing our organism's infection from foreign ones. Any such foreign particle that may trigger an immune response is known as an antigen. What's really impre...