Environmental Science – Astronomy: Stars

Stars are large incandescent bodies. Stars radiate electromagnetic, heat, and light energy which produces their light. Hotter stars glow with shorter wavelength lights making them blue in color. Stars are held together by gravity. Hydrogen combines through fusion reactions producing energy and forming Helium. The lifestyle of a star is as shown below: Stars begin [...]

The Respiratory System

Welcome back to the systems blogs! The respiratory system has the major function of gas exchange, the uptake of oxygen from the environment and the release of carbon dioxide into the environment. Organs imporant in this system are blood vessels, lungs, diaphragm, heart, and the nose. Alveoli are functional units in this system located in [...]

Digestive System

The digestive system has the function of breaking down food to retrieve nutrients and minerals for use such as energy and filter out waste. Major organs include the intestines (small and big), stomach, esophagus, liver, mouth, gallbladder, pancreas, etc. Functional units include muscles and sphincters, muscular layer modified into ring-like valves at junctions in segments [...]

The Immune System

The immune system has the major function of defending the body from invaders such as pathogenic bacteria and viruses which can lead to diseases, sicknesses, and death. The functional unit of this system are white blood cells called lymphocytes and antibodies that have the ability to attach to microbes and mark them for death and [...]

Multicellular Development

A new finding recently at the University of Queensland has unearthed some secrets about the origins of multi-cellular animals. As you all know, a multi-cellular organism is composed of multiple cells, just like us humans, but at first life was unicellular. Professor Bernie Degnan used new technology to find out that the first multi-cellular animals [...]

The Reproductive System

Welcome back, today's topic is the reproductive system. This has the major function of reproducing offspring of a species to continue its survival. Major organs include the vagina, penis, ovary, and testes, with functional units such as eggs and sperm produces by meiosis. The female human goes through a menstrual cycle where ovulation occurs at [...]

The Nervous System

Welcome back to our systems talks! Today will be about nervous system. The nervous system is tasked with controlling all our movements, thoughts, and processes. Major organs include the brain, spinal cord, nerves, and blood vessels, and neurons, or nerve cells which are their functional units. Neurons are organized into nerve nets, and in complex [...]

The Excretory System

Welcome back to our systems blogs! Take a quick trip to the bathroom before reading this one, its going to be long! The excretory system has the major function of excretion, which is the loss of nitrogen containing waste and byproducts of metabolic processes in the animal body. Major organs involved in this system include [...]

The Muscular System

Hey everyone! This is the first stem talks post in our series of posts about body systems! This is going to be a good one so kick back, relax, enjoy the sunlight, and get ready to learn! 😀 The muscular system is one of the most important fiber systems in the animal body. The system [...]