Archive for the 'diseases' Category

The deadliest viruses on Earth

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Did you know that there are more than 320,000 viruses that can infect mammals? One of the most talked-about viruses nowadays is SARS-CoV-2, which causes COVID-19, but it is not the deadliest. There are other even more lethal viruses that are the stuff of nightmares.

This might leave you wondering where these viruses come from and how they can kill you. In our video, we explore all these questions and bring you a specific list of the deadliest viruses. The candidates on that list may surprise you.

For instance, rabies is one of the most dangerous viruses around. The virus causes about 56,000 deaths per year in more than 95 percent of Africa and Asia.

It is mostly transmitted from domestic dogs, but bats and rats also play a minor role. One bite from an infected animal can result in inflammation of the brain, nausea, vomiting, violent movements, and even a fear of water.

By then, it’s too late for the infected individual, and death typically occurs after a few days due to cardio-respiratory arrest.

Rabies is only one of the most lethal viruses on Earth right now. If you’re curious about our other picks and how they affect humans, watch our video to find out more.

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Dangers of smoking | Health | Biology | FuseSchool

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Dangers of smoking | Health | Biology | FuseSchool

Did you know that smokers are twice as likely to have a heart attack? And that one in two smokers will die from a smoking-related disease.

In fact all of these things are negatively affected by smoking… pretty much every organ in your body!

Circulation; Heart; Lungs; Mouth and throat; Stomach; Brain; Skin; Reproduction and fertility; Bones

We all know that smoking is bad, but do you know why?

That’s what we’re going to discover in this video.

When you pass someone smoking, does it make you cough or your chest feel tight?

Perhaps you thought it was the smell? It’s actually because you’re inhaling dangerous substances into your body.

Nicotine is a toxin that stimulates your body to produce adrenaline. This increases your heart rate and raises your blood pressure, thus making your heart work harder. It is also addictive, which is why it’s very difficult for smokers to quit.

Tar contains over a thousand chemicals. It forms a tacky brown or yellow residue – which is why some smokers have stained teeth. And if you could see them – stained lungs too.

Some of the chemicals in tar are carcinogens – so they cause cancer, making lung, mouth and throat cancers more common in smokers.

The last culprit you need to know about is Carbon Monoxide. It is an odourless, colourless and extremely poisonous gas. The carbon monoxide permanently binds to haemoglobin in your blood, blocking oxygen from binding.

So oxygen can’t be transported around the body and used for respiration, causing shortness of breath and fatigue. Your heart once more has to beat even faster to supply the body with the oxygen it needs.

Let’s now look at some diseases caused by smoking…

Emphysema is when the tiny structures in your lungs called alveoli, break down.

As alveoli are responsible for gas exchange, this is not good news. The inhaled smoke causes the walls of the alveoli to weaken and decrease in surface area, making gas exchange less efficient. Unsurprisingly, breathing becomes much harder and smokers are much more at risk of coughs and chest infections.

Smoking also causes the cilia in the lungs to become irritated, and produce excess mucus.

So that’s the lungs. And we saw earlier that nicotine and carbon monoxide make the heart work much harder.

Now the blood vessels.

Plaque building up in the coronary arteries, so the ones that transport oxygen rich blood around the heart, can over time cause a blood clot to form, which cuts off some of the heart muscle and causes it to die. This is the most common cause of heart attacks.

So we’ve seen that smoking increases your risk of heart, lung, kidney disease, strokes and cancers.

Smoking can also make your bones more brittle and so more likely to break. And also it can greatly reduce fertility in both men and women.

So, now you know some of the harmful effects smoking has on your body and why we’re told not to do it. But the good news… once you stop smoking, your health improves and your body will begin to recover. It’s never too late to give up!

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Cigarettes aren’t good for us. That’s hardly news — we’ve known about the dangers of smoking for decades. But how exactly do cigarettes harm us, and can our bodies recover if we stop? Krishna Sudhir details what happens when we smoke — and when we quit.

Lesson by Krishna Sudhir, directed by TED-Ed.

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Top 10 Terrible Things Smoking Does to Your Body

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Top 10 Terrible Things Smoking Does to Your Body

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Top 10 Terrible Things Smoking Does to Your Body
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It’s not very healthy, to say the least. From cataracs, to infertility, to cancer, these are just some of the disgusting things that smoking can cause. WatchMojo counts down the Top 10 Terrible Things Smoking Does to Your Body.

Check out our other videos of the Top 10 Unhealthy Health Foods: https://www.youtube.com/watch?v=IZihRNJqyH4, the Top 10 Shocking Foods That Will Give You Cancer: https://www.youtube.com/watch?v=Lg0G86iHuA4, and the Top 10 Things We ALL Do That Are Bad for the Environment: https://www.youtube.com/watch?v=asy1F0Y4iD0.

#10. It Causes Cataracts
#9. It Weakens the Immune System
#8. It Increases the Visible Signs of Aging
#7. It Causes Infertility
#6. It Weakens Your Bones
#5. It Causes Gum Disease, Bad Breath, and Tooth Loss
#4. It Makes Your Blood Thicker
#3, #2 & #1???

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How pandemics spread

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How pandemics spread

Dig into the history of pandemics to learn how viruses and disease spreads and what we can do to stop future outbreaks.

In our increasingly globalized world, a single infected person can board a plane and spread a virus across continents. Mark Honigsbaum describes the history of pandemics and how that knowledge can help halt future outbreaks.

Lesson by Mark Honigsbaum, directed by Patrick Blower.

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GCSE Biology – What Are Bacterial Diseases? – Treatment and Prevention #28

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We cover the bacterial diseases Salmonella and Gonorrhoea. Learn their causes, symptoms and treatments.

How are pathogens spread and controlled | Health | Biology | FuseSchool

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Pathogens are disease causing microorganisms.

They can be spread in many ways; by direct contact, by water or by air. Different pathogens are spread by different mechanisms.

How can transmission be reduced or prevented?
Depending upon which disease you are trying to reduce transmission for, depends upon which methods you need to engage.

Simple hygiene measures can reduce or prevent the spread of many diseases, including flu and the common cold.

To reduce or prevent cholera and other diarrhoea causing pathogens, communities need access to safe drinking water, adequate sanitation so that dirty water is not exposed and basic hygiene needs such as washing hands properly, boil water properly and keep surfaces clean.

Malaria and yellow fever both have mosquitos as their vector, and lyme disease uses ticks. A vector is an organism that has an active role in transmitting pathogens from one host to another. To prevent or reduce infection from vector borne diseases, the vectors need to be controlled or humans protected against the vector such as wearing mosquito repellent and wearing long sleeved clothing. Insecticide and spraying techniques can be used to reduce the populations of the vectors, but this is trickier and more expensive.

If a disease is highly contagious, such as rabies, people may need to be isolated to prevent the infection spreading to others.

Vaccinations are also an option for preventing and reducing pathogens. Vaccinations involve putting a small amount of inactive or dead pathogen into the body, which stimulates the body to produce antibodies against the specific pathogen. This enables the body to be prepared to attack and destroy this pathogen if they are infected in future.

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Let’s watch this animation to learn about some disease-causing microorganisms in human beings and what we can do to prevent these diseases.

AIDS/Dr. Anthony Fauci (NIH, 1984)

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Presents current research, findings, and questions related to Acquired Immune Deficiency Syndrome (AIDS). The director of the National Institute of Allergy and Infectious Diseases, Dr. Anthony Fauci, presents. AIDS first appeared in the United States in 1979 and is defined by secondary complications such as the presence of pneumocystis pneumonia and other opportunistic infections, or Kaposi’s sarcoma resulting from an underlying immune deficiency caused by the virus HTLV3. Dr. Fauci notes that AIDS research is not only the first priority of the Public Health Service, but also has occupied the interest and energy of a substantial portion of the global biomedical research community. The lecture covers the history of the disease in the United States as well as circumstantial evidence suggesting that the virus emerged in West Africa. It addresses AIDS’ history, epidemiology, clinical manifestations, and etiology as well as development in treatments and prevention of the syndrome. Despite a high fatality rate, Dr. Fauci predicts that with the identification and isolation of the underlying cause, scientists will achieve major breakthroughs in vaccine development, antiviral chemotherapy directed against HTLV III, and immunological reconstitution.

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Disease! Crash Course World History 203

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In which John Green teaches you about disease, and the effects that disease has had in human history. Disease has been with man since the beginning, and it has shaped the way humans operate in a lot of ways. John will teach you about the Black Death, the Great Dying, and the modern medical revolution that has changed the world.

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GCSE Biology – How A Mushroom Can Kill You – Fungal and Protist Disease #29

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Learn what fungi and protist are and how they can cause ‘Rose Black Spot’ and ‘Malaria’. We also cover vectors and parasites, and the symptoms and treatments of each disease

Static GK- Diseases caused by Microorganisms – Bacteria, Virus, Fungi, Protozoa

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Static GK- Diseases caused by different Microorganisms – Bacteria, Virus, Fungi, Protozoa – Static GK- Diseases caused by different Microorganisms – diseases caused by viruses, diseases caused by Bacteria,diseases caused by Fungi, Bacterial diseases list, diseases caused by Protozoa. The list of diseases and the microorganisms that cause the disease is as follows –
Diseases caused by Bacteria
 Cholera- Vibrio cholera
 Anthrax- Bacillus Anthraces
 Diphtheria -Corynebacterium diphtheria
 Leprosy – Mycobacterium leprae
 Botulism – Clostridium botulinum
 Syphilis – Treponema pallidum
 Tetanus – Clostridium tetani
 Trachoma -Chlamydia trachomatis
 Tuberculosis -Mycobacterium tuberculosis
 Typhoid fever – Salmonella typhi.
 Whooping cough-Bordetella pertussis
 Diseases caused by Virus
 AIDS-Human Immunodeficiency Virus (HIV)
 Influenza – Influenza virus
 Mumps- Mumps Virus
 Polio -Polio Virus
 Chicken Pox -Varicella zoster virus
 Measles-Measles Virus
 Dengue fever -Dengue Virus
 Chikungunya -Chikungunya virus.
 Rabies -Rabies virus
 SARS – SARS coronavirus
 Diseases caused by Fungi
 Athlete’s foot – caused by the mold Epidermophytonfloccosum
 Diseases caused by Protozoa
 Malaria –   Plasmodium vivax
 Amoebic dysentery – Entamoebahistolytica
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The video discusses the GK Topic of Human diseases caused by Microorganisms – Bacteria, Fungi, Virus and Protozoa. All types of questions asked in Competitive exams have been covered. There are tips to memorize the topic easily.

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A bacterial disease, any of a variety of illnesses caused by bacteria. Until the mid-20th century, bacterial pneumonia was probably the leading cause of death among the elderly. Improved sanitation, vaccines, and antibiotics have all decreased the mortality rates from bacterial infections, though antibiotic-resistant strains have caused a resurgence in some illnesses. In the early 21st century, tuberculosis, which is caused by Mycobacterium tuberculosis—several strains of which had developed resistance to one or more drugs widely used to treat the infection—was among the deadliest infectious diseases worldwide.

Bacteria cause disease by secreting or excreting toxins (as in botulism), by producing toxins internally, which are released when the bacteria disintegrate (as in typhoid), or by inducing sensitivity to their antigenic properties (as in tuberculosis). Other serious bacterial diseases include cholera, diphtheria, bacterial meningitis, tetanus, Lyme disease, gonorrhea, and syphilis.

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