write about diffrent typesin human body cells and their function
Answers
Answer:
1. Epithelial Cells. These cells are tightly attached to one another. They cover over the interior of hollow organs, like blood vessels or digestive organs, or else form the surface of things, like the skin. There are dozens of types of epithelial cells. Without epithelial cells, you would have no skin to protect your body from injury and would have no stomach to digest your food!
2. Nerve Cells. These cells are specialized for communication. They send signals from the brain to muscles and glands that control their functions. They also receive sensory information from the skin, the eyes, and the ears, and send this information to the brain. There are dozens of varieties of nerve cells in the body, each with its own shapes and functions. You would have no consciousness or control over your body without nerve cells.
3. Muscle Cells. These cells are specialized for contraction. Without muscle cells, you would not be able to move! There are three kinds of muscle cells. They pull and tug on bones and tendons to produce motion. They also form the thick outer walls of hollow organs, like blood vessels and digestive organs, and can contract to regulate the diameter of these hollow organs.
4. Connective Tissue Cells. These cells provide structural strength to the body and also defend against foreign invaders like bacteria. Two types of cells—fibroblasts and fat cells—are native to connective tissue. Other cells migrate into connective tissue from the bloodstream to fight diseases. Special types of connective tissue—cartilage and bone—are designed to be stronger and more rigid than most connective tissues.
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Answer:
When you consider the complexity of the human body, it is no surprise that there are hundreds of different types of cell. Below is a small selection of human cell types:
Stem cells
Stem cells are cells that are yet to choose what they are going to become. Some differentiate to become a certain cell type, and others divide to produce more stem cells. They are found in both the embryo and some adult tissues, such as bone marrow.
Bone cells
There are at least three primary types of bone cell:
Osteoclasts, which dissolve bone.
Osteoblasts, which form new bone.
Osteocytes, which are surrounded by bone and help communicate with other bone cells.
Blood cells
There are three major types of blood cell:
red blood cells, which carry oxygen around the body
white blood cells, which are part of the immune system
platelets, which help blood clot to prevent blood loss after injury
Muscle cells
Also called myocytes, muscle cells are long, tubular cells. Muscle cells are important for a huge range of functions, including movement, support, and internal functions, such as peristalsis — the movement of food along the gut.
Sperm cells
Sperm are the smallest type of human cell.
These tadpole-shaped cells are the smallest in the human body.
They are motile, meaning that they can move. They achieve this movement by using their tail (flagellum), which is packed with energy-giving mitochondria.
Sperm cells cannot divide; they only carry one copy of each chromosome (haploid), unlike the majority of cells, which carry two copies (diploid).
Female egg cell
Compared with the sperm cell, the female egg cell is a giant; it is the largest human cell. The egg cell is also haploid so that the DNA from the sperm and egg can combine to create a diploid cell.
Fat cells
Fat cells are also called adipocytes and are the main constituent in adipose tissue. They contain stored fats called triglycerides that can be used as energy when needed. Once the triglycerides are used up, the fat cells shrink. Adipocytes also produce some hormones.
Nerve cells
Nerves cells are the communication system of the body. Also called neurons, they consist of two major parts — the cell body and nerve processes. The central body contains the nucleus and other organelles, and the nerve processes (axons or dendrites) run like long fingers, carrying messages far and wide. Some of these axons can be over 1 meter long.
In a nutshell
Cells are as fascinating as they are varied. In one sense they are autonomous cities that function alone, producing their own energy and proteins; in another sense, they are part of the huge network of cells that creates tissues, organs, and us.