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Yogita Ingle 7 years, 1 month ago
The heart is an organ which beats continuously to act as a pump for the transport of blood, which carries other substances with it. The human heart is divided into four chambers. The upper two chambers are called right and left atrium and the lower two chambers are called the right and left ventricles. Right atrium receives carbon dioxide-rich blood from the body. Blood from right atrium enters the right ventricle, which contracts and pumps the blood to the lungs. On the other hand, oxygen-rich blood from the lungs returns to the left atrium. From the left atrium, blood enters left ventricle. Left ventricle contracts and pumps the blood to all parts of the body. Hence, the rhythmic contraction and expansion of various chambers of the heart maintains the transport of oxygen to all parts of the body.
Posted by Adarsh Rai 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
The term water retention signifies an abnormal accumulation of fluid in the circulatory system or within the tissues or cavities of the body. Water is found both inside and outside the body’s cells.
Posted by Ashutosh Pandey 7 years, 1 month ago
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Yogita Ingle 7 years, 1 month ago
The Red blood cells are also called erythrocytes. RBCs store the hemoglobin, which is a respiratory pigment that binds to oxygen or carbon dioxide molecules. This helps in the transportation of the oxygen to different tissues and organs of the human body. It also takes away the carbon-dioxide from these organs and tissues to be replenished in the lungs. Hemoglobin mainly comprises of iron which combines with the oxygen, thus giving the reddish color to the blood. The main function of the RBCs is the transportation of nutrients and the hormones throughout the human body.
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Meghna Thapar 5 years, 10 months ago
The major organs of respiratory system in human beings are: (i) Nose (ii) Nasal Passage (iii) Trachea (iv) Bronchi (v) Lungs and (vi) diaphragm.
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.
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Meghna Thapar 5 years, 10 months ago
Rainwater harvesting can be done in two ways:
- Rooftop rainwater harvesting: In this method, the rainwater is collected from the rooftop to a storage tank through pipes. This water may contain soil particles from the roof and needs to be filtered before use. Instead of collecting rainwater in the tank, the pipes can go directly into the percolation pit in the ground. The water seeps into the soil to recharge or refill the ground water.
- Rainwater harvesting from open spaces around buildings. Rainwater goes into the ground directly from the roadside.
Posted by Pragati . 7 years, 2 months ago
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Meghna Thapar 5 years, 10 months ago
A food web is a complex feeding system in which several food chains are interlinked. In a forest, several food chains are interlinked. In case one food chain is disturbed, the other food chain is there to support the animals of the next feeding level.
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Meghna Thapar 5 years, 10 months ago
The movement of water molecules through a selectively permeable membrane is called osmosis. It is affected by the amount of substance dissolved in water. Thus, osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration.
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Yogita Ingle 7 years, 1 month ago
Fishes have certain projections on their body known as gills. These are feathery organs . These gills are connected with blood vessels for easy exchange of gases. These gills help the aquatic species like fish to utilize the oxygen dissolved in the water. The gills continuously keeps on moving that enables it to take the water. It takes the water through its mouth and forces it through the gills.
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