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Cells, and its Function

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  Functions of cells In order for a cell to survive it must be able to carry out a variety of functions. such as growth, respiration, reproduction, excretion, sensitivity/sensation,movement and nutrition. Growth:- Cells have the ability to grow until they are mature and ready to reproduce.A cell can grow and repair itself by manufacturing protein. Respiration:- Every cell requires oxygen for the process of respiration. Oxygen is absorbed through the cell’s semipermeable membrane and is used to oxidise nutrient material to provide heat and energy. The waste products of cell respiration include carbon dioxide and water. These are passed out from the cell through its semipermeable membrane. Reproduction:- When growth is complete in a cell, reproduction takes place. The cells of the human body reproduce Or divide by the process of mitosis. Excretion:- During metabolism, various substances are produced which are of no further use to the cell and can be damaging. These waste products are re
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Cells , and its Structure

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  Cells:- The cell is the fundamental unit of all living organisms and is the simplest form of life that can exist as a self-sustaining unit.  Cells are, therefore, the building blocks of the human body. Cells in the body take many forms, the size and  shape being largely dependent on their specialised  function.  For example, some cells help fight disease, others transport oxygen or produce movement, some manufacture proteins or chemicals, and others  function to store nutrients. Cell structure:-  Outer part of the cell Cell membrane:- The cell membrane, or plasma membrane, is a fine membrane that encloses the cell and protects its contents. This membrane is semipermeable, in that it selectively controls the movement of molecules into and out of the cell.  Oxygen, nutrients and hormones are taken into the cell as needed and cellular waste, such as carbon dioxide, passes out through the membrane. As well as governing the exchange of nutrients and waste materials, its function is also t
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ATRIAL FIBRILLATION (heart disease)

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Overview:- Atrial fibrillation (AF) is a type of abnormal heart rhythm in which the atria (the upper chambers of the heart) beat irregularly and rapidly. This causes the heart to pump less efficiently and increases the risk of blood clots, which can lead to stroke. Symptoms:-     .    Palpitations     .    Shortness of breath     .   Fatigue     .   Chest pain     .   Lightheadedness. causes:- . Coronary artery disease . High blood pressure . Heart failure . Cardiomyopathy . Thyroid disorders . Sleep apnea . Alcohol consumption . Obesity . Valvular heart disease . Chronic lung disease . Certain medications . Genetic factors Prevention :- Atrial fibrillation (AF) can be prevented by addressing and managing the underlying risk factors and underlying conditions that may contribute to its development. Some ways to prevent AF include: 1. Maintaining a healthy lifestyle: Eating a healthy diet, getting regular physical activity, maintaining a hea
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HUMAN HEART

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  The human heart is a muscular organ located in the thoracic cavity, behind the sternum and between the lungs. It has four chambers: the right atrium and ventricle, and the left atrium and ventricle. The right atrium receives deoxygenated blood from the body and pumps it into the right ventricle, which then pumps it to the lungs for oxygenation. The left atrium receives oxygenated blood from the lungs and pumps it into the left ventricle, which then pumps it to the rest of the body. The heart also has four valves: the tricuspid valve, the pulmonary valve, the mitral valve and the aortic valve, which help regulate blood flow and prevent backflow. The heart is surrounded by the pericardium, a sac that contains a small amount of fluid to lubricate and protect the heart. The heart is also supplied by coronary artery.
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