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Types of tissue and their functions in the human body

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´╗┐Epithelial tissue Simple squamous: Simple squamous epithelial cells are thin and flat (the thinnest of all epithelial cell-types), which allows them to have a large surface area that is exposed to the lumen on one side (the apical surface), and to the basement membrane on the other basolateral surface. The cells, scale-like in appearance, tend to have larger, elliptically-shaped nuclei. As a simple type of epithelium, simple squamous epithelium is one cell-layer thick, and thus every cell of the tissue comes in direct contact with the basement membrane. As with other types of epithelia, simple squamous epithelial cells are bound together by tight junctions, forming a selective barrier, which is crucial to its function. Simple squamous epithelial cells function as mediators of filtration and diffusion. Due to their simple and thin construct, they allow for easy transmembrane movement such as across the membrane, and through the cell of small molecules. Some molecules, such as oxygen and carbon dioxide diffuse freely across the simple squamous epithelia according to concentration gradients. Other molecules, such as ions, utilize transmembrane protein channels to diffuse across the cells; therefore, the types of proteins that are present in a given simple squamous epithelial tissue partially determine the function of that tissue. ...read more.


Areolar connective tissue is made of cells and extracellular matrix "extra" means "outside" so the extracellular matrix is material that is outside of the cells. The matrix has two components, fibres and ground substance. In the images on this page, you can see the fibres very easily which look like threads. The only part of the cells that is visible is the nucleus. The ground substance has no structure, so you can't tell that it is there. The ground substance fills all of the spaces between the cells and fibres. Muscle tissue Stratified muscle tissue: The stratified muscle found in the skeletal has an appearance of light sand dark stripes going though it visible using a light telescope. A single skeletal muscle cell is long and approximately cylindrical in shape, with many nuclei located at the edges of the cell. The muscles are fibrous, dense tissues, which their function is to allow the body to move by repeated contraction and relaxation. Besides movement, the muscle is also responsible for maintaining posture, stabilising the joints, and producing body heat through muscle function. The movement of striated muscle is controlled voluntarily, unlike the smooth muscle of the internal organs and the cardiac muscle of the heart, which are involuntary. ...read more.


Heart: The heart is the organ that supplies blood and oxygen to all parts of the body. It is about the size of a clenched fist, weighs about 10.5 ounces and is shaped like a cone. Blood is pumped away from the heart through arteries and returns to the heart through veins. The major artery of the body is the aorta and the major veins of the body are the vena cavae. 1. In order for the organs to stay alive and function properly, they need nutrients and oxygen. The nutrients and oxygen reach our organs through blood. Blood is delivered to the organs through arteries.Metabolic wastes and Carbon Dioxide occur as a result of the consumption of these nutrients and oxygen by the cells. Again these materials carried by blood, this time by the veins, go back to the heart to collect and clean the blood. 1. The heart is also made of cardiac muscle. This type of muscle only exists in your heart. Unlike other types of muscle, cardiac muscle never gets tired. It works automatically and constantly without ever pausing to rest. Cardiac muscle contracts to squeeze blood out of your heart, and relaxes to fill your heart with blood. 1. The nervous system makes sure the heart is working by sending impulses by neurons to the heart to make it contract which controls the speed of your heart. 1. ...read more.

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