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Ask QuestionPosted by Akansha Aku 5 years, 4 months ago
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Posted by Miss Bhumi Aarohi Rao 5 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
Working of Human blood circulatory system takes place in the steps below:
(i) When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.
(ii) When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1.
(iii) When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries.
(iv) The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart.
(v) When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2.
(vi) When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.
Posted by Miss Bhumi Aarohi Rao 5 years, 4 months ago
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Posted by Miss Bhumi Aarohi Rao 5 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
In human beings, air is taken into the body through the nostrils, is filtered by fine hairs that line the passage. When air passes through the nasal passage, the dust particles and other impurities present in it are trapped by nasal hair and mucus so that clean air goes into the lungs. From here, the air passes through the throat and into the lungs. Trachea does not collapse even when there is no air in it because it is supported by rings of soft bones called cartilage.
Within the lungs, the passage divides into smaller and smaller tubes which finally terminate in balloon-like structures which are called alveoli. The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood-vessels. When we breathe in, the ribs are lift up and the diaphragm flattens which increases the size of the chest cavity. Because of this, air is sucked into the lungs and fills the expanded alveoli. The blood brings carbon dioxide from the rest of the body for release into the alveoli, and the oxygen in the alveolar air is taken up by blood in the alveolar blood vessels to be transported to all the cells in the body. During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
Posted by Miss Bhumi Aarohi Rao 5 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
Digestion of food in human beings begins in the mouth. The mouth cavity contains teeth, tongue and salivary glands. The teeth cut the food into small pieces, chew and grind it. This is called physical digestion. Salivary glands produce saliva which mixes with the food. This involves chemical digestion of food. The saliva contains an enzyme called salivary amylase which digests the starch and converts it into maltose sugar. Mouth opens into a small funnel shaped area called pharynx which leads to a long tube called oesophagus. It carries the food down into the stomach. The wall of oesophagus is muscular. When the slightly digested food enters the food pipe, the walls of the oesophagus starts contraction and expansion movements called peristaltic movements which push the food into the stomach. Digestion does not take place in the oesophagus.
The glands present on the walls of the stomach secrete gastric juice that contains hydrochloric acid, the enzyme pepsin and mucus. A small amount of gastric lipase is also present that breaks down the fats present in the food. Gastric juice is acidic due to the presence of HCl which is necessary for the pepsin to become active and converts the proteins into peptones. The mucus protects the stomach walls from HCl. From the stomach, the partially digested food goes into the small intestine through sphincter muscle. Small intestine is divided into two parts: Duodenum and Ileum.
Duodenum receives the secretions of two glands, liver and pancreas through a common duct. Liver secretes bile which is alkaline and contains salts to emulsify the fats (or lipids). The bile secreted by the liver is stored in the gall bladder. Pancreas secretes pancreatic juice which contains trypsin, lipase and pancreatic amylase. Trypsin digests the proteins, lipase emulsifies the fats and pancreatic amylase breaks down the starch. Thus, small intestine is the site of complete digestion of carbohydrates, proteins and fats. The walls of ileum secrete succus entericus which completes the digestion process.
The walls of small intestine has finger like projections like villi which increases the surface area for absorption. The villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body, where it is utilised for obtaining energy, building up new tissues and the repair of old tissues.
Posted by Atul Kumar 5 years, 4 months ago
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Posted by Tejasvini S 5 years, 4 months ago
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Nidhi Girish 5 years, 4 months ago
Posted by Tanisha Yadav 5 years, 4 months ago
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Suyash Tripathi 5 years, 3 months ago
Posted by Jeevan.G. Chaudhary 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The cerebrum is further divided into four sections or lobes:
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Frontal lobe: It is associated with parts of speech, planning, reasoning, problem-solving and movements.
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Parietal lobe: Help in movements, the perception of stimuli and orientation.
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Occipital lobe: It is related to visual processing.
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Temporal lobe: This region is related to perception and recognition of memory, auditory stimuli, and speech.
Charvi Sangwan 5 years, 4 months ago
Posted by Jeevan.G. Chaudhary 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The medulla oblongata is a small structure present in the lowest region of the brain. It mainly controls the body’s autonomic functions such as heartbeat, breathing, and digestion. It plays a primary role in connecting the spinal cord, pons and the cerebral cortex. Also, it helps us in maintaining our posture and controlling our reflexes.
Posted by Jeevan.G. Chaudhary 5 years, 4 months ago
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Meghna Thapar 5 years, 2 months ago
The hypothalamus is composed of several different areas and is located at the base of the brain. One important function of the hypothalamus is the control of body temperature. The hypothalamus acts as like a "thermostat" by sensing changes in body temperature and then sending out signals to adjust the temperature. The absence of the corpus callosum seems to affect the development of behavioral characteristics and cause specific behavioral anomalies. Taken together, evidence from previous studies with AgCC patients suggest that social cognitive impairments may relate to the missing corpus callosum.
Posted by Jeevan.G. Chaudhary 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Schwann cells are cells in the peripheral nervous system that synthesize the myelin sheath around neuronal axons. It is also known as neurilemma cell. It helps to myelinate the axons of the PNS which helps to help to increase the saltatory conduction of the neuron.
Posted by Jeevan.G. Chaudhary 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
Ohm’s Law states that the potential difference between two points is directly proportional to the electric current.
This means; potential difference V varies as electric current.
Or, V ∝ I
Or, V/I=R -----------(1)
Where R is constant for the given conductor at a given temperature and called resistance. Resistance is the property of conductor which resists the flow of electric current through it.
Posted by Akash Shivaswamy 5 years, 4 months ago
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Posted by Tanya Gupta 5 years, 4 months ago
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Tejasvini S 5 years, 4 months ago
Posted by Prathamesh Shevale 5 years, 4 months ago
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Atul Kumar 5 years, 4 months ago
Jeevan.G. Chaudhary 5 years, 4 months ago
Posted by Aadil Ansari 5 years, 4 months ago
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Jeevan.G. Chaudhary 5 years, 4 months ago
Posted by Anupama ?? 5 years, 4 months ago
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Jeevan.G. Chaudhary 5 years, 4 months ago
Posted by Prabhjot Kaur 5 years, 4 months ago
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Posted by M. Nithika 5 years, 4 months ago
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???????????????? ?? ????? 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
The idea of satyagraha basically emphasised the power of truth and the demand to search for truth. It suggested that if the cause was true, if the struggle was against injustice, then the physical force was not necessary to fight the oppressor. Without asking vengeance or being aggressive, a satyagrahi could win the battle through nonviolence. This could be done by appealing to the conscience of the oppressor. The common people – including the oppressors – had to be persuaded to see the truth, rather than being forced to accept truth with the help of violence. By this huge and great struggle, the truth was bound to ultimately triumph. Mahatma Gandhi had s strong that this dharma of non-violence could unite all Indians.
Posted by Akshita Akshita 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
(i) Stock:
(a) Material in the environment, which have the potential to satisfied human needs.
(b) They are not accessed due to the lack of technology.
(c) Example: Water is a compound of two inflammable gases—hydrogen and oxygen, which can be used as a rich source of energy. But we do not have the required technical knowhow to use them for this purpose.
(ii) Potential resources:
(a) They are found in a region.
(b) They have not been utilized or developed.
(c) Example: Rajasthan and Gujarat have enormous potential for the development of wind and solar energy, but they are yet to be developed for various reasons.
Posted by Sunidhi Singh 5 years, 4 months ago
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Posted by Kunal Kumar Jha 5 years, 4 months ago
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Posted by Rahul Kumawat 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
x² - 2x - 3 = 0
x² - 3x + x - 3 =0
x ( x - 3) + 1 (x - 3) = 0
(x + 1) ( x- 3) = 0
x + 1 = 0 x - 3 = 0
x = -1 or x = 3
Posted by Mahm10D Mollah 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
- Black soils are made up of extremely fine ; clayey material.
- They are well-known for their capacity to hold moisture.
- They are rich in soil nutrients such as calcium carbonate, magnesium, potash and lime.
- They develop deep cracks during hot weather, which helps in the proper aeration of the soil.
Posted by ?? ? 5 years, 4 months ago
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Posted by Pooja Choudhary 5 years, 4 months ago
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Posted by Thiru Selvam 5 years, 4 months ago
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Angel Ram Joshi 5 years, 4 months ago
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Diksha Rai 5 years, 4 months ago
1Thank You