MIR ASRAR

 Ncert shortnotes on human respiratory system Human respiratory system consists of a pair of nostrils, pharynx, larynx, bronchi and bronchioles that finally terminates into alveoli. Nasal chamber  open into pharynx that leads to  larynx . Larynx contains voice box (sound box) that help in sound production. The trachea, primary, secondary and tertiary bronchi and initial bronchioles are supported by  incomplete cartilaginous rings  to prevent collapsing in absence of air. Each bronchiole terminates into an irregular walled, vascularized bag like structure called  alveoli . The branching network of bronchi, bronchioles and alveoli collectively form the lungs. Two lungs are covered with double layered  pleura  having pleural fluid between them to reduce the friction on lung surface. Conducting parts  include nostrils, pharynx, larynx and trachea. Main functions include- Transport of atmospheric air to alveoli. Removing foreign particles from air, humidifying it and bringing it to body tem

 __This is what i make for u is  ncert shortnotes. CENTRAL NERVOUS SYSTEM The brain is the central information processing organ of our body, and acts as the ‘command and control system’. It controls the voluntary movements, balance of the body, thermoregulation, and the brain also processes vision, hearing, speech etc. The human brain is well protected by the skull. Inside the skull, the brain is covered by  cranial meninges  consisting of an outer layer called  dura mater a very thin middle layer called  arachnoid and an inner layer called  pia mater . The brain can be divided into three major parts: forebrain midbrain hindbrain Fig. Brain  Forebrain The forebrain consists of cerebrum thalamus hypothalamus A deep cleft divides the cerebrum longitudinally into two halves, which are termed as the left and right  cerebral hemispheres . The hemispheres are connected by a tract of nerve fibres called  corpus callosum . The layer of cells which covers the cerebral hemisphere is called  cere

  HEART , the mesodermally derived organ, is situated in the thoracic cavity, in between the two lungs, slightly tilted to the left. It has the size of a clenched fist. It is protected by a double walled membranous bag, pericardium, enclosing the pericardial fluid. Our heart has four chambers, two relatively small upper chambers called atria and two larger lower chambers called ventricles. A thin, muscular wall called the inter- atrial septum separates the right and the left atria, whereas a thick-walled, the inter-ventricular septum, separates the left and the right ventricle The atrium and the ventricle of the same side are also separated by a thick fibrous tissue called the atrio-ventricular septum. However, each of these septa are provided with an opening through which the two chambers of the same side are connected. The opening between the right atrium and the right ventricle is guarded by a valve formed of three muscular flaps or cusps, the tricuspid valve, whereas

 ELECTROCARDIOGRAPH(ECG)

 My first ever poem on my mother read it and relate it .. "Mother is a summer of winter and winter of summer " <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-4249528535307907"      crossorigin="anonymous"></script>

  Recently, Waqar Younis also gave his take on the issue. Speaking on   A Sports ,  he criticised the Langer’s praise for Warner in this matter. The Australia coach had earlier said: “Oh my gosh, it’s one of the best things I’ve ever seen in the game of cricket,” Langer had said while talking about Warner’s six. I can’t believe anyone would have the instincts to do that — it was unbelievable. In fact, most people probably would’ve been not sure what to do … it was a no-ball, and to have the talent and ability to hit it for six — unbelievable.” “It’s fine, It is legal. He was within his right to hit it, and he went for it that’s all good. But to promote it is wrong. The way it’s being praised by Justin Langer, that is ridiculous. What are you teaching the little kids? You can do the same if that’s your mindset, but don’t teach the youngsters that it’s fine to go for it if you get the opportunity.” <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?