Welcome to Biology Notes Online! We are the BNO Team, dedicated to providing high-quality, accessible biology study notes for students and teachers alike. Our goal is to simplify complex biological concepts and present them in an easy-to-understand format, entirely free of charge. Whether you're preparing for exams, teaching a class, or simply passionate about biology, our comprehensive notes are designed to support your learning and teaching journey.
Antibiotic resistance or Drug resistance to bacteria is a modern enemy of the new generation. Before we know about antibiotic resistance, we must first know what bacteria are? Bacteria is a type of germs, which is found inside or outside of human or animal bodies. Most of the bacteria are harmless, and some of them … Read more
What is Human Circulatory Circuit? Definition of Human Circulatory Circuit The human circulatory circuit, also known as the cardiovascular system, is a complex network comprising the heart and blood vessels that facilitate the continuous flow of blood throughout the body, ensuring the transport of oxygen, nutrients, and waste products to and from cells. This system … Read more
What is Human Circulatory System? Definition of Human Circulatory System The human circulatory system is a complex network of blood vessels, including arteries, veins, and capillaries, driven by the heart, responsible for transporting nutrients, oxygen, hormones, and waste products throughout the body. Features of Circulatory System The human circulatory system, a cornerstone of physiological functionality, … Read more
What is Blood Pressure? Definition of Blood Pressure Blood pressure is the force exerted by circulating blood against the walls of the arteries, measured in terms of systolic and diastolic pressures during the cardiac cycle. Types of Blood Pressure Blood pressure, a critical physiological parameter, is the force exerted by circulating blood against the walls … Read more
What is Digastric Muscle? Digastric Muscle Definition The digastric muscle is a bilaterally paired suprahyoid muscle located beneath the jaw, characterized by two distinct ‘bellies’—an anterior and a posterior section—that play pivotal roles in jaw movement and swallowing. Characteristics of Digastric Muscle The digastric muscle exhibits several distinctive characteristics: Where is the Digastric Muscle Located? … Read more
What is Submandibular Gland? Definition of Submandibular Gland The submandibular gland is one of the major salivary glands located beneath the floor of the mouth, responsible for producing a significant portion of saliva that aids in lubrication and digestion. Anatomical Position of Submandibular Gland Situated within the anterior region of the submandibular triangle, the submandibular … Read more
What is Smooth Muscle? Definition of Smooth Muscle Smooth muscle is an involuntary, non-striated muscle tissue found primarily in the walls of hollow organs and blood vessels, responsible for functions such as regulating blood flow and propelling substances through organs. Characteristics of smooth muscle Smooth muscle tissue, distinct from its skeletal and cardiac counterparts, exhibits … Read more
What is Muscle? Definition of Muscle A muscle is a specialized tissue in animals that contracts to produce force and movement, composed of fibers containing proteins that enable contraction. Structure of Muscle Types of Muscle Muscles, integral to the vertebrate anatomy, are categorized into three primary types based on their structural and functional attributes: skeletal, … Read more
What is Lamina Propria? Definition of Lamina Propria The lamina propria is a layer of loose connective tissue found beneath the epithelium in mucous membranes, providing structural support, facilitating nutrient passage, and serving as a protective barrier against foreign substances and organisms. Lamina Propria Structure Lamina Propria Functions The lamina propria, an integral component of … Read more
What is Osmoregulation? Role of ADH, Renin-Angiotensin and Aldosterone in Osmoregulation 1. Role of ADH (Anti-diuretic Hormone) in Osmoregulation The role of the antidiuretic hormone (ADH), also known as vasopressin, in osmoregulation is pivotal for maintaining the body’s water balance and ensuring the stability of its internal environment. Here’s a detailed and sequential explanation of … Read more
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