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- Components of blood and their functions pdf writer
- 1. Composition of Blood and its Functions
- Red Blood Cells (Erythrocytes)
Components of blood and their functions pdf writer
Homeostasis is a four-part dynamic process that ensures ideal conditions are maintained within living cells, in spite of constant internal and external changes. The four components of homeostasis are a change, a receptor, a control center and an effector. Changes occur constantly in and around the cells of living systems. A change is anything that requires a cell to react, such as a change in temperature, pressure or chemical composition inside or surrounding the cell.
For example, your blood pressure has risen after vigorous exercise. Receptors, or nerve endings, are located in every system and tissue. As the control center receives impulses from its remote receptors, it sends commands to the effector to counteract the change in the environment. Using the same example, the medulla oblongata commands the effector -- the heart in this case -- to slow its pulse.
Control centers are located in the brain. The effector acts on the impulses from its specific command center, counteracting the change and returning the internal and external cell environment to a balanced state. Effectors are the physical change agents such as the heart, organs and fluids of the body -- the workhorses of homeostasis. Kelvin Hayes has been writing professionally since as a freelance copywriter.
He runs his own online business, writing ebooks, reports and information products. Completely self-taught, Hayes prides himself on creatively completing writing projects by pulling from his wide range of life experiences. About the Author. Copyright Leaf Group Ltd.
1. Composition of Blood and its Functions
Blood is slightly denser and is approximately three to four times more viscous than water. Blood consists of cells that are suspended in a liquid. As with other suspensions , the components of blood can be separated by filtration. However, the most common method of separating blood is to centrifuge spin it. Three layers are visible in centrifuged blood.
It transports everything that must be carried from one place to another within the body- nutrients, wastes headed for elimination from the body and body heat through blood vessels. Long before modern medicine, blood was viewed as magical, because when it drained from the body, life departed as well. Carrier of gases, nutrients, and waste products. Oxygen enters blood in the lungs and is transported to cells. Carbon dioxide, produced by cells, is transported in the blood to the lungs, from which it is expelled. Ingested nutrients, ions, and water are carried by the blood from the digestive tract to cells, and the waste products of the cells are moved to the kidneys for elimination.
The lymphatic system consists of all lymphatic vessels and lymphoid organs. Hence, rather than representing a single organ, the lymphatic system comprises a circulatory network of vessels and lymphoid tissue and cells in every part of the body. It works together closely with the blood-producing haematopoietic system in the bone marrow, thereby playing a vital role in immune responses to protect the body from various pathogens. Also, the lymphatic vessel network helps transporting nutrients and waste products in the body. The lymphatic system with its vessel network is — apart from the circulatory system, with which it is closely connected — the most important transport system in the human body. The human body produces about two litres of lymph every day.
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Red Blood Cells (Erythrocytes)
The FDA has developed guidelines on deferrals due to medications. Pharmacists can utilize these guidelines as well as their drug knowledge to both reduce unnecessary deferrals and ensure the safety of donors and recipients. Blood donation centers in the United States collect over
This in plasma. The composition of mammalian blood follows: a very large protein that functions in blood coagulation. Blood in animal cognition by authors in the field.
Blood is a suspension of blood elements erythrocytes, leukocytes, and platelets in blood plasma. Blood elements can be separated from blood plasma using centrifugal force. Figure shows that the most descended are erythrocytes — the volume of erythrocytes in a sample of blood is called the hematocrit.
A red blood cell has what is known as a biconcave shape. Both sides of the cell's surface curve inward like the interior of a sphere.
Inflammation , a response triggered by damage to living tissues. The inflammatory response is a defense mechanism that evolved in higher organisms to protect them from infection and injury. Its purpose is to localize and eliminate the injurious agent and to remove damaged tissue components so that the body can begin to heal. The response consists of changes in blood flow, an increase in permeability of blood vessels , and the migration of fluid, proteins , and white blood cells leukocytes from the circulation to the site of tissue damage. An inflammatory response that lasts only a few days is called acute inflammation, while a response of longer duration is referred to as chronic inflammation.