Earth Science: Biology – Humans – Sensory Organs Our sensory organs provide us with information about our environment. The five main senses are sight, hearing, smell, taste, and touch. Nowadays, it is also common to include the receptors that are located inside an organism or inside organs (proprioceptors) on the list of senses. The proprioceptors … Read more
Earth Science: Human Nervous System – Brain and Spinal Cord The brain is an incredibly complex organ. It coordinates all incoming information. The spinal marrow receives and sends messages from the body to the brain. Neurobiologists have long sought to understand the human brain. This high-performance organ processes all the sensory information arriving from the … Read more
Earth Science: Biology – Humans – Nervous System The human nervous system does not only control the vital processes of the body, it is also a mediator to the world around us, as it can pick up, evaluate, and store stimuli. It can be subdivided into the central nervous system (CNS), including spinal cord and … Read more
Earth Science: Human – Metabolism and Hormones – Hormones Hormones are information carriers in the human body. Instead of the electrical impulses used by the nervous system, the hormone system uses chemical messenger substances and is, therefore, much slower. Hormones are signaling molecules, responsible for regulating bodily functions, sending messages, and acting on organs and … Read more
Earth Science: Biology – Humans – Water and the Kidneys Water in the body serves as a means of transportation and a dissolving agent, and it helps to regulate body temperature. The kidneys play a major role in maintaining the water balance in the body and removing toxins. The human body contains between 65 and … Read more
Earth Science: Human – Metabolism and Hormones – Digestion The utilization of food mainly takes place in the small intestine. The required nutrients are then distributed through the body. Nutrition should be as varied as possible in order to assure an optimal supply of all “fuels.” After nutrients from the stomach have entered the small … Read more
Earth Science: Human – Metabolism and Hormones The human body regularly takes in nutritional material from outside, transports it and processes it, and eliminates waste and foreign material. Hormones play an important role in most metabolic processes. Earth Science: Biology – Humans – Nutrition Plants produce their own nutrients; however, humans do not. Instead, we … Read more
Earth Science: Anatomy Human – Blood Blood is a bodily fluid, red in color, which circulates in the blood vessels and carries out important functions within the body. These include oxygen transport, heat regulation, signal transmission, and defense against illness, among other tasks. In humans, blood cells make up about 45 percent of the blood … Read more
Earth Science: Biology – Humans – Heart and Circulation The heart is the organ that distributes blood around the body through vessels such as arteries, veins, and capillaries. The human body’s blood is circulated by one central organ: the heart. A healthy heart sends blood, oxygen, and various nutrients contained in the blood to all … Read more
Earth Science: Anatomy – Joints, Muscles, and Tendons Coordinated movements are made possible by joints and flexible tendons connecting the rigid skeletal bones of the musculoskeletal system. Muscles are essential for the movement of limbs as well as organ functions. Joints are a flexible connection between two bones. Normally, the end of a bone fits … Read more
