Neurons or nerve cells are cells of the nervous system that transmit nerve impulses coming from sensory cells or from other nerve cells. Signals between neurons occur via synapses, specialized connections with other cells. Neurons are the core components of the nervous system, which includes the brain, and spinal cord of the central nervous system (CNS), and the ganglia of the peripheral nervous system.
Red blood cells, or erythrocytes, are the most common type of blood cell and the vertebrate organism's principal means of delivering oxygen (O2) to the body tissues via the blood flow through the circulatory system. They take up oxygen in the lungs or gills and release it while squeezing through the body's capillaries. These cells' cytoplasm is rich in haemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the blood's red color. Red blood cells are also known as RBCs, red cells, haematids, erythroid cells or erythrocytes.
DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person’s body has the same DNA. DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone.
An important property of DNA is that it can replicate, or make copies of itself. Each strand of DNA in the double helix can serve as a pattern for duplicating the sequence of bases. This is crucial when cells divide because each new cell needs to have an exact copy of the DNA that is present in the old cell.
Signal transduction occurs when an extracellular signaling molecule activates a cell surface receptor. In turn, this receptor alters intracellular molecules creating a response. There are two stages in this process:
1. A signaling molecule activates a specific receptor protein on the cell membrane.
2. A second messenger transmits the signal into the cell, eliciting a physiological response.
In either step, the signal can be amplified. Thus, one signalling molecule can cause many responses.
The crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina. The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, allowing a sharp image of the object of interest to be formed on the retina. This adjustment of the lens is known as accommodation. It is similar to the focusing of a photographic camera via the movement of its lens.
HCV is a contagious liver disease that results from infection with the hepatitis C virus. The virus is spread when blood from an infected person enters the body of another. It is among the most common viruses that infect the liver. Hepatitis C can be transmitted via sex with an infected person, or sharing of items contaminated with infectious blood. Hepatitis C is not spread through breast milk, water or food, or by casual contact such as kissing and sharing food or drinks with an infected person.
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