Encyclopedic Guide to the Branches of Science
Foundations of Life and Biological Sciences
Biology serves as the primary branch of science that deals with life in all its manifestations and forms. Within this broad field, Botany is dedicated to the study of plants, while Zoology focuses on the various animals that inhabit the Earth. Microbiology is a specialized branch that investigates microorganisms, which are typically too small to be seen without the aid of a microscope. Mycology is the branch that deals with the study of fungi, representing a diverse group of organisms. Specific fungi examples cited include Fomitopsis feei, Irpex lacteus, Ganoderma lucidum, Datronia, Pleurotus ostreatus, Fomes fomentarius, Myrothecium roridum, Polyporus arcularius, Trametes versicolor, Trametes hirsuta, and various species within the Aspergillus and Penicillium geastrivorus groups.
Ecology is the scientific discipline that examines the complex relationships of living things to each other and to their surrounding environment. Complementing this is the field of Evolutionary Biology, which deals with the origin and descent of species over time to understand how modern organisms developed. On a different scale, Entomology explores the world of insects, while Ichthyology focuses on the study of fish. Herpetology is the branch of science dedicated to the study of reptiles and amphibians. Ornithology and Mammalogy focus on birds and mammals, respectively, providing a comprehensive understanding of the animal kingdom’s biodiversity.
Medical and Physiological Branches of Science
Anatomy is the branch of science that deals with the internal structures of living things, providing the structural basis for other medical sciences. Histology specializes in the study of body tissues, which are categorized into four primary types: connective tissue, epithelial tissue, muscle tissue, and nervous tissue. Hematology is the specialized study of blood. The composition of blood includes plasma, which makes up about , red blood cells at approximately , and white blood cells and platelets, which account for about of the total volume. Endocrinology deals with hormones and the various glands that produce them, including the Thymus, Adrenal gland, Pituitary gland, Pineal gland, Thyroid, Pancreas, Ovary, and Testicle.
Cardiology is the study of the heart, while Hepatology deals with the liver, the biliary tree, the gallbladder, and the pancreas. Osteology and Arthrology focus on the hard structures of the body, specifically bones and joints respectively. Odontology is the scientific study of teeth. In the context of organisms that inhabit the body as pests or parasites, Helminthology focuses on parasitic worms. Examples of such organisms include the Human Whipworm, Ascaris, Liver Fluke, Pinworm, Pork Tapeworm, and Bovine Tapeworm. Acarology is a related field focusing on ticks and mites, while Arachnology deals with spiders and other arachnids.
Cellular, Genetic, and Molecular Sciences
Cytology is the branch of science that deals with the study of cells, which are the fundamental building blocks of life. This field investigates various specialized cells, including brain cells, liver cells, blood cells, intestinal cells, and muscle cells. Karyology is a more specific branch that deals with cell nuclei, including the detailed study of the nuclear envelope, nucleolus, nuclear pores, and DNA. Genetics investigates the principles of heredity, exploring how traits are passed down through alleles. Specific examples of these are the A allele, B allele, and O allele, which determine blood types such as Type A, Type B, Type AB (which represents a codominant relationship), and Type O.
Embryology is the science that focuses on the formation and development of living things from the point of fertilization until birth. At a molecular level, Enzymology is the branch that deals with enzymes and their catalytic functions. Virology focuses on the study of viruses, with a prominent modern example being the Corona virus, specifically COVID-19. Bacteriology is the specific study of bacteria, rounding out the microscopic study of organisms that can affect human health and the environment.
Physical, Earth, and Environmental Sciences
Physics is a fundamental branch of science that deals with the structure of matter and how the fundamental constituents of the universe interact with one another. Chemistry is another physical science that focuses on the properties of matter and the chemical reactions it undergoes. Geology is the comprehensive study of the Earth, while Oceanography is dedicated to the study of the world's oceans. Paleontology provides a bridge between the physical and biological sciences by studying the history of life on Earth through the analysis of fossils.
Astronomy is the study of celestial bodies and the wider universe. This includes the study of the Sun and the planets within our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Seismology is the scientific study of earthquakes, focusing on concepts such as the fault, epicenter, focus, and the generation of seismic waves. Volcanology is the branch dedicated to the study of volcanoes. Finally, there are specialized botanical sciences such as Graminology, which deals with the study of grasses, and Dendrology, which focuses on the study of trees, as well as Apiology, which is the specific study of honey bees.