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Transportation: Blood circulation in Human Body
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- Blood is the vital fluid flowing in vessels, responsible for transporting:
- Digested food from the small intestine.
- Oxygen from the lungs to cells.
- Waste from the body for excretion.
- Components of Blood
- Plasma: The fluid where cells are suspended.
- Red Blood Cells (RBC): Contain haemoglobin which binds and transports oxygen. Haemoglobin binds with oxygen and transports it to all the parts of the body and ultimately to all the cells. Gives blood its red colour.
- White Blood Cells (WBC): Defend the body against germs.
- Platelets: Play a key role in clotting, preventing excessive bleeding from injuries.
This orchestrated symphony of blood circulation in the human body is fundamental to sustaining life and maintaining the delicate balance necessary for optimal health.
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The Heart: A Rhythmic Journey Through its Four Chambers
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- The heart, a vital muscular organ orchestrating blood circulation in the human body, boasts four chambers: left atrium, left ventricle, right atrium, and right ventricle.
- The carbon dioxide-rich blood has to reach the lungs for the carbon dioxide to be removed, and the oxygenated blood from the lungs has to be brought back to the heart.
- This oxygen-rich blood is then pumped to the rest of the body.
- Atria and ventricles contract and relax in a coordinated manner, facilitated by valves.
- The heart’s muscular walls contract and relax rhythmically, producing a heartbeat.
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A Scientific Exploration of Blood Flow in the Human Heart
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- Flow of Oxygenated Blood: Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left, the left atrium.
- The left atrium relaxes when it is collecting this blood. It then contracts, while the next chamber, the left ventricle, relaxes, so that the blood is transferred to it.
- When the muscular left ventricle contracts in its turn, the blood is pumped out to the body.
- Flow of Deoxygenated Blood: Deoxygenated blood comes from the body to the upper chamber on the right, the right atrium, as it relaxes.
- As the right atrium contracts, the corresponding lower chamber, the right ventricle, dilates.
- This transfers blood to the right ventricle, which in turn pumps it to the lungs for oxygenation.
- This intricate process highlights the precise and synchronized nature of blood circulation in the human body orchestrated by the heart.
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Understanding Heartbeat and Pulse in Human Physiology
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- A heartbeat is the rhythmic contraction and relaxation of the heart’s chambers.
- A heartbeat can be felt on the left side of the chest and heard using instruments like a stethoscope.
- Each heartbeat creates a pulse in the arteries, and the pulse rate indicates the heart rate.
- The two are directly related.
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Cardiac Diversity: Exploring Heart Circulation Across Animal Kingdoms
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- Separation of the right and left sides of the heart prevents the mixing of oxygenated and deoxygenated blood.
- Birds and mammals have four-chambered hearts for efficient oxygen supply, while amphibians and reptiles have three-chambered hearts.
- Fish have two-chambered hearts with single circulation.
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Vascular Dynamics: The Roles of Arteries, Veins, and Capillaries in Blood Circulation
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- Arteries carry blood away from the heart under high pressure with thick, elastic walls.
- Veins play a crucial role as they collect blood from organs, including deoxygenated blood, and skillfully return it to the heart. Equipped with valves, veins prevent backflow, contributing to the precision of blood circulation in human body.
- Capillaries, one-cell thick vessels, facilitate the exchange of materials between blood and cells.
- Maintenance of blood pressure is crucial for efficient circulation.
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Platelets and Clotting
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- Platelet cells in the blood help clotting at points of injury to prevent excessive bleeding.
- Clotting is essential for minimizing blood loss and maintaining pressure in the circulatory system.
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Lymphatic System
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- Lymph is a colourless fluid formed from plasma, proteins, and blood cells escaping into tissues through capillary pores.
- Lymph drains into lymphatic capillaries, carrying digested fats and draining excess fluid back into the blood.
- Lymph nodes filter and remove impurities from lymph.
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Transportation in Plants
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- Photosynthesis: Plants take in simple compounds like CO2 and perform photosynthesis in chlorophyll-containing organs, mainly leaves.
- Nutrient From Soil: Soil is a rich source of raw materials such as nitrogen, phosphorus, and minerals.
- Roots, in contact with the soil, absorb these substances for plant growth.
- Transportation: Efficient transportation is crucial when distances between soil-contacting organs and chlorophyll-containing organs are large.
- Plants, having low energy needs, can afford relatively slow transport systems.
- Tissues Involved: Xylem and phloem are independently organized conducting tubes for moving water, minerals, and products of photosynthesis.
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Xylem – Water Transport
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- Vessels and tracheids in roots, stems, and leaves form interconnected channels for water transport.
- Active uptake of ions in root cells creates a concentration difference, causing water to move into the roots.
- Transpiration, the loss of water vapour from leaves, creates suction, pulling water from roots to leaves.
- Transpiration also aids in temperature regulation.
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Phloem Dynamics: The Intricacies of Food and Substance Transport in Plants
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- Translocation in phloem involves the movement of soluble products of photosynthesis, amino acids, and other substances.
- Sieve tubes, with the help of companion cells, facilitate upward and downward translocation.
- Unlike the xylem, translocation in the phloem requires energy from ATP to transfer material and increase osmotic pressure.
- This pressure helps move materials according to the plant’s needs, such as transporting stored sugar to growing buds in spring.
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