Science > Physics > Motion in a Straight Line > Numerical Problems on Displacement, Average Speed, Velocity In this article, we shall study to solve problems to calculate displacement, Average Speed, and average Velocity. Example – 01: A train travels a distance of 100 m due east in 10 seconds. What is its speed and […]
Science > Physics > Motion in a Straight Line > Terminology of Motion Motion is an important part of our life. Our daily activities involve motion of different kinds. In this topic, we shall study the terminology of motion. Mechanics: The branch of physics which deals with the effects of forces on object is called […]
The process in which a DNA molecule produces exact copy or replica of itself is known as replication of DNA. In eukaryotes, replication of DNA takes place inside the nucleus. In DNA replication, the double helix (parent strand) unzips forming two separate strands called templates. These templates provide the base sequences used to synthesize new DNA (daughter) strands. […]
In this article, we shall study the difference between DNA and RNA, and also the structure of RNA. Differences between RNA molecules and DNA molecule: RNA contains ribose sugar units while DNA contains deoxyribose sugar unit. RNA contains the base uracil while DNA contains thymine. RNA is single-stranded, except in some viruses while DNA is […]
In this article, we shall study the structure of DNA. Each cell in a particular living organism contains the exact same DNA. The size of the DNA polymer is directly related to the complexity of the organism; more complex organisms tend to have larger molecules of DNA, while less complex organisms have smaller DNA. For e.g. […]
Karl Landsteiner in 1900 discovered that blood in all persons is not alike and hence clumping or agglutination occurs on the mixing of blood of certain persons. Blood group is determined by the antigens present on the surface of RBC’s. An antigen is a molecule (in this case a carbohydrate) that acts as a signal, […]
Since the heart relies on aerobic respiration to supply its energy needs, cardiac muscle cells are richly supplied with mitochondria. Our hearts beat about once every second of every day of our lives or over 2.5 million times in an average life span. The only time the heart gets a rest in between beats. Position: […]
Regulation of Cardiac Activity: Normal activities of the heart are regulated in an essential or natural way, meaning it is autoregulated by specialized muscles or the nodal tissue, therefore the heart is called myogenic. A special neural center in the medulla oblongata can moderate the cardiac function through the autonomic nervous system (ANS). Neural signals can […]
In this article, we shall study the origin and measurement of blood pressure. Origin of Blood Pressure: Due to the contraction of the heart and by the muscles that surround our blood vessels, blood moves through our circulation system since it is under pressure by it. The measure of this force is blood pressure. In […]
In this article, we shall study blood vessels and their types: arteries, veins, and capillaries. Study of blood vessels is called Angiology. Blood vessels form a network of blood circulating vessels starting from the heart (left ventricle) arteries arterioles capillaries venules veins back to the heart (right auricle). Arteries and Arterioles: Arteries carry blood from […]