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Mawgan Find ot the characteristics of blood cells

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Mawgan Find ot the characteristics of blood cells

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White blood cells, or leukocytes, are an important part of the body's immune system. Your leukocyte count rises when you have an infection, as your body creates more of these cells to fight against viruses, bacteria, and other invading micro-organisms. Various types of white blood cells are continuously produced within the body to keep the immune system strong. Parts of the body that produce and harbor white blood cells are the bone marrow, lymph nodes, spleen and thymus.

Bone Marrow

Most white blood cells are produced in the bone marrow. Types of white blood cells produced within the bone marrow are granulocytes, lymphocytes and monocytes. Granulocytes are white blood cells designed to destroy bacterial invaders. Lymphocytes are white blood cells that include B cells and T cells. B cells target bacteria and toxic substances and T cells destroy virus-infected or cancerous body cells. Monocytes are large white blood cells that consume foreign particles.

Lymph Nodes

The lymphatic system's function is a defensive one. It is part of the immune system and consists of a network of vessels that drain tissue fluid into the lymph nodes. These lymph nodes are filled with two types of white blood cells, T and B lymphocytes. They are produced in the lymph nodes to fight disease and eliminate infection.

Spleen

The spleen performs a variety of functions such as blood filtration, blood storage, blood clotting and the production of red and white blood cells. There are red pulp and white pulp within the organ. The red pulp contains half the body's reserves of monocytes while the white pulp produces white blood cells to continue to support the immune system.

Thymus Gland

The thymus is key to immune response and has a role in developing special lymphocytes called T cells. T cells develop within the thymus after the bone marrow produces these lymphocytes. There they wait until they are activated against disease. T cells regulate immune response and attack infected or abnormal body cells. The thymus also passes lymphocytes into the lymphatic system, which transports them to where they are needed.

About the Author

Jay Jay Waltz has been writing professionally since 2009, focusing on health, wellness and nutrition. He has written for various online publications. Waltz is a National Academy of Sports Medicine-certified personal trainer while undergoing corrective rehabilitation training. Waltz also holds a Bachelor of Science in public health environmentalism from the Southern Connecticut State University.

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Parts of the Body That Make White Blood Cells

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White blood cells, or leukocytes, are an important part of the body's immune system. Your leukocyte count rises when you have an infection, as your body creates more of these cells to fight against viruses, bacteria, and other invading micro-organisms. Various types of white blood cells are continuously produced within the body to keep the immune system strong.

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Kevin McCloud: Slumming It (2010)  - Ep1

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Label the parts of a typical prokaryotic cell

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wetland

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Kirsi

Earth from space

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Mick -' that has sorted the Greens out  !'

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Mick -' that has sorted the Greens out  !'

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Sing along to learn Photosynthesis

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http://www.telegraph.co.uk/news/worldnews/asia/china/10162236/Carpet-of-green-algae-covers-sea-in-China.html

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https://www.boundless.com/biology/introduction-to-evolution/history-of-evolutionary-thought/early-views-on-classification-of-living-things/

http://outline-of-history.mindvessel.net/20-the-record-of-the-rocks/21-the-first-living-things.html

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1 July 2013 - Class contribution of living things

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1 July 2013 - Class contribution of living things

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Moving

Breathing

Growth

Sensitivity

What's missing?

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7 Characteristics of Living Things

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What is biology? Simply put, it is the study of life, in all of its grandeur. Biology concerns all life forms, from the very small algae to the very large elephant. But how do we know if something is living? For example, is a virus alive or dead? To answer these questions, biologists have created a set of criteria called the "characteristics of life."

The Characteristics of Life

Living things include both the visible world of animals, plants, and fungi as well as the invisible world of bacteria and viruses.

On a basic level, we can say that life is ordered. Organisms have an enormously complex organization. We're all familiar with the intricate systems of the basic unit of life, the cell.

Life can "work." No, this doesn't mean all animals are qualified for a job. It means that living creatures can take in energy from the environment. This energy, in the form of food, is transformed to maintain metabolic processes and for survival.

Life grows and develops. This means more than just replicating or getting larger in size. Living organisms also have the ability to rebuild and repair themselves when injured.

Life can reproduce. Have you ever seen dirt reproduce? I don't think so. Life can only come from other living creatures.

Life can respond. Think about the last time you accidentally stubbed your toe. Almost instantly, you flinched back in pain. Life is characterized by this response to stimuli.

Finally, life can adapt and respond to the demands placed on it by the environment. There are three basic types of adaptations that can occur in higher organisms.

Reversible changes occur as a response to changes in the environment. Let's say you live near sea level and you travel to a mountainous area. You may begin to experience difficulty breathing and an increase in heart rate as a result of the change in altitude. These symptoms go away when you go back down to sea level.

Somatic changes occur as a result of prolonged changes in the environment. Using the previous example, if you were to stay in the mountainous area for a long time, you would notice that your heart rate would begin to slow down and you would begin to breath normally. Somatic changes are also reversible.

The final type of adaptation is called genotypic (caused by genetic mutation). These changes take place within the genetic makeup of the organism and are not reversible. An example would be the development of resistance to pesticides by insects and spiders.

In summary, life is organized, "works," grows, reproduces, responds to stimuli and adapts. These characteristics form the basis of the study of biology.

Basic Principles of Biology

The foundation of biology as it exists today is based on five basic principles. They are the cell theory, gene theory, evolution, homeostasis, and laws of thermodynamics.

Cell Theory: all living organisms are composed of cells. The cell is the basic unit of life.

Gene Theory: traits are inherited through gene transmission. Genes are located on chromosomes and consist of DNA.

Evolution: any genetic change in a population that is inherited over several generations. These changes may be small or large, noticeable or not so noticeable.

Homeostasis: ability to maintain a constant internal environment in response to environmental changes.

Thermodynamics: energy is constant and energy transformation is not completely efficient.

Subdiciplines of Biology
The field of biology is very broad in scope and can be divided into several disciplines. In the most general sense, these disciplines are categorized based on the type of organism studied. For example, zoology deals with animal studies, botany deals with plant studies, and microbiology is the study of microorganisms. These fields of study can be broken down further into several specialized sub-disciplines. Some of which include anatomy, cell biology, genetics, and physiology.

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What is biology? Simply put, it is the study of life, in all of its grandeur. Biology concerns all life forms, from the very small algae to the very large elephant. But how do we know if something is living? For example, is a virus alive or dead?