Types Of Blood Vessels In Human BodyThere are three types of blood vessels present in human circulatory system. (A) Arteries: • Arteries carry blood from heart and supply to organs. These are thick muscular walled and deep seated. All Arteries carry oxyg…

Transportation In Human BeingsIn humans, transportation of oxygen nutrients, hormone and other substances to tissue, CO2 to the lungs and waste products to the kidneys is carried out by a well-defined Circulatory System. In lower organisms material is tr…

Function Of Transporation In Human BodyFood: It is available at particular points, e.g. leaves in plants, alimentary canal in animals. Food has to be transported to every living cell of the body for extraction of energy and materials. Metabolic Gases: O…

Mechanism Of Respiratory SystemRespiratory centre is in Medulla Oblongeta. Mechanism of breathing involves Two Phases. (A) Inspiration (B) Expiration Inspiration: Intercostal and phrenic muscles of diaphragm contract to increase thoracic cavity, therefor…

Frank ICSE Solutions for Class 9 Biology – Health Personal and Social PAGE NO:203 Solution 1. Hygiene is the science of preserving and promoting good health. The major aspects of personal hygiene are:CleanlinessPhysical exerciseRest and sleepHealthy habi…

Human Body Systems Overview and Homeostasis Overview and HomeostasisLevels of OrganizationLiving things have different levels of organization. The simplest level of organization is that of the cell. A group of cells with a similar function is called a t…

Nervous System and DrugsNervous RegulationNerve cells or neurons also allow cells to communicate with each other. Neuron communications are one way organism can detect and respond to stimuli at both the cellular and organism level. This detection and re…

Evolution: VariationsVariationVariations are differences between groups of organisms of one species. Mutation is one source of variation between different groups within a species. The variation of organisms within a species increases the likelihood that…

Evolution: MutationsMutationsOne source of the variation driving the process of evolution is mutation. Mutation is the change in DNA of an organism which may result in that organism being different than its parents. While there are many causes of mutatio…

Human Biosphere/InfluenceVocabulary: biodiversity, monoculture, greenhouse effect, endangered species, exotic/invasive species, acid precipitation, global warming, CFCs, SEQR, biodegradableBiodiversityDue to evolution, there is a great number of differe…