The kidneys are connected with two major blood vessels: the renal artery and the renal vein. In the kidney, the renal arteries divide into several arterioles. These arterioles form a mesh-like network in the glomerulus. The blood under high pressure enters this network and is filtered through the capillary network of the glomerulus. These capillaries […]
A kidney consists of several excretory units, called nephrons, that work together to produce urine. They are called the filtering (functional) units of the urinary system. The main parts of the nephrons are: the glomerulus or the Malpighian body, Bowman’s capsule, proximal convoluted tubule, loop of Henle, distal convoluted tube and collecting tube, which work
David Copperfield was a sweet boy who was born in a small village of England. He lived with his mother and maid, Peggotty. He had a mirthful childhood, and loved them both very much. He was sent to the best school, and was very well looked after by both women. After some years, when David
Urinary Bladder The urinary bladder is a storage organ (elastic in nature) of the excretory system of the liquid waste in the form of urine. It is located behind the pubic bone in the pelvis. The bladder muscles contract while urination. This contraction of muscles opens two sphincters or valves at the end of the
The ureter is hollow tube-like structure which makes a bridge between the kidney and the urinary bladder. Each kidney is connected with a ureter. Ureters carry urine from the kidney to the urinary bladder. The length of the ureter ranges from 10-12 inches. Each ureter enters the bladder through a tunnel in the bladder wall,
It was the year 1866. Some strange reports had created a chaos in America and Europe. There had been numerous attacks on ships sailing in the Pacific Ocean. The people who survived the attacks claimed to have seen a large monster with many blowholes. The creature seemed to bear a resemblance to a whale. It
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One day, Jesus and His disciples crossed the Sea of Galilee in a boat to Bethsaida. After hearing about John the Baptist’s death, Jesus wanted to be alone for some time in order to pray for the deceased’s soul. But people followed Jesus on foot from the towns. They knew that He performed great miracles.
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There lived a young woman named Mary in a small town of Nazareth in Galilee. She was engaged to be married to Joseph, a young carpenter, who was a descendant of King David. One day, God sent His angel, Gabriel, to give Mary an important message. “Rejoice, Mary,” said Gabriel, “You are the most blessed
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Kidneys are dark reddish-brown coloured, bean-shaped organs of the excretory system, located in the back of the abdomen. Kidneys filter liquid waste and work as a disposal system of the body. Each kidney is connected with a renal artery and a renal vein. Nephrons are the basic functional units of a kidney. A kidney houses
The excretory system is an organ system that helps eliminate the liquid waste from the body. This organ system consists of the following organs: a pair of kidneys, ureter, bladder and urethra. Each organ of this system performs a specific task. The kidneys form the liquid waste (urine) by filtration of plasma. The ureter carries
The islets of Langerhans are the endocrine part of the pancreas. These are the clusters of prism-shaped cells that release a hormone known as insulin which is required for the conversion of excess sugars into glycogen in the liver and muscles. Another hormone released by this gland is glucagon which is an antagonist of insulin.
The adrenal glands are located on the upper part of each kidney. The adrenal glands consist of an outer part and inner part. The outer part is called the cortex, and the inner part is called medulla. The cortex secrets a group of hormones called cortin, and the medulla secrets a hormone called adrenalin. Cortin
Nebuchadnezzar, the king of Babylon, conquered Israel and took all the strong young men as captives. He trained them in learning science. Daniel was also chosen for the training. One day, King Nebuchadnezzar was disturbed. He called his wise men and told them about a strange dream, which he had forgotten. He asked for the
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Solomon was the fourth son of King David. He was anointed king just before the death of David. When David was on his deathbed, he told his son to obey God and be a good king. Solomon was very young and he realized that he was too inexperienced to rule over a great nation, such
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The pinkish-grey coloured gland located at the upper part of the chest is the thymus gland. It is one of the main organs of the immune system. At birth, this gland is quite small but as growth progresses its size increases. It grows till a person attains puberty and then it shrinks again. Its functions