Components of human heart sounds
By: Dr Pandula Siribaddana
Overview: The human heart consist of four chambers which will alternate blood within these chambers throughout the cardiac cycle in order to receive blood from the rest of the body, oxygenate the received blood by sending it to the lungs, receive oxygenated blood from the...
What is the parathyroid gland?
By: Tarek Musslimani
In this article, I will discuss the normal physiology of the parathyroid gland, in addition to two disorders that often affect this gland. These are hyperparathyroidism and hypoparathyroidosim. The first disorder refers to excessive secretion of the parathyroid hormone to the circulation by the parathyroid...
Structure and function of the lungs
By: Imonikhe Ahimie
The lung is the primary respiratory organ in all air breathing animals, which group includes most of the tetrapods, i.e. all vertebrates other than fishes, and a few fishes such as the Australian lung fish. The main job of the lung is to transfer...
Process of excretion by the human body
By: Fiona Mather
The physiological meaning of excretion is to expel waste from the body, to isolate and discharge waste matter generated during metabolism. This is achieved by the body's ability to rid itself of excess fluid by urination and by defecation, eliminating solid waste after the body...
Structure and function of the heart
By: Imonikhe Ahimie
The heart is the propulsive organ which is present in all animals that have a circulatory system which maintains the circulation of the blood by means of rhythmical contractions. The organ is a fixture amongst all vertebrates and it is composed of cardiac muscle, an...
Overview of the function of the human bones
By: Tarek Musslimani
Bone in general is a form of connective tissue that has a cellular component as well as a matrix. The only difference between bone and other normal connective tissue is by the fact that its matrix is mineralized with extremely hard solid tissue. The bone...
Structure and function of the colon
By: Imonikhe Ahimie
The colon is the last part of the digestive system, and together with the cecum and rectum makes up the large intestine. Although it is a part of the digestive system, the colon does not actually carry out any digestive functions; indeed, the entire big...
The role of Lactobacillus acidophilus bacteria in the human digestive tract
By: Alicia M Prater PhD
Lactobacillus acidophilus is a commensal bacterium - it lives in the gastrointestinal tract of humans and other animals without causing disease. The bacteria metabolize lactose, a sugar found in milk and dairy products. Byproducts of the metabolism are lactic acid and antimicrobial products that prevent...
Understanding the process of muscle contraction
By: Lime Red Tetrahedron
Muscle contraction begins when a nerve impulse reaches the synaptic terminals of a motor neuron that synapses with a muscle fiber. The motor neuron releases an excitatory neurotransmitter, which then diffuses across the neuromuscular junction. The neurotransmitter then encounters receptors on the surface of the...
How the human eye works
By: Lime Red Tetrahedron
How the Human Eye Functions The eye is a biological marvel - it allows us to sense objects at vast distances at nearly theoretical resolution. We rely on this sense organ more than any other to live our everyday lives. Its structure and function is...

 

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