Human Body Systems Flashcards, test questions and answers
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What is Human Body Systems?
The human body is a complex and fascinating system composed of many different parts, each with its own unique purpose. There are numerous systems that work in tandem to keep the body functioning optimally. These include the circulatory, respiratory, digestive, endocrine, reproductive and nervous systems. Each of these systems plays an essential role in our everyday lives by providing us with physical and mental health necessary for survival.The circulatory system is responsible for transporting oxygen-rich blood throughout the body to all its organs and tissues. It comprises of the heart, arteries and veins which keep the blood flowing continuously around the body at an optimal rate. The heart pumps oxygenated blood from the lungs where it has been replenished with oxygen to be circulated throughout the body; while veins return deoxygenated blood back to the heart which then sends it back out through arteries to be reoxygenated once again. The respiratory system is also vital for survival as it helps us breathe in air which contains oxygen needed by our bodies as fuel for energy production. This system encompasses two main organs: lungs and nose which together filter out harmful pollutants from entering our bodies while allowing us to take in fresh air filled with oxygen molecules necessary for life support functions such as respiration and metabolism among others. The process begins when we inhale air which then enters our lungs where tiny sacs called alveoli exchange gases like carbon dioxide (CO2) or nitrogen (N2) with those contained within our bloodstream such as oxygen (O2). Our digestive systems help break down food particles into smaller components so they can be absorbed more easily by cells lining our small intestines; this process requires enzymes secreted from glands like salivary glands present inside mouth or pancreas located behind stomach walls that act upon food molecules chemically breaking them down into simpler forms that can be digested more effectively within intestines before getting absorbed into bloodstream through their walls eventually reaching different cells throughout entire body. Meanwhile endocrine system comprises hormone secreting glands like pituitary gland located at base of brain controlling key bodily functions including growth development metabolism reproductive processes etc., while reproductive organ produces gametes enabling conception between male female partners forming new organism capable sustaining life cycle further perpetuating species survival even after death individual responsible creating such organism.