Diseases

What is anxiety?

What is anxiety? The anxiety is a normal part of the emotional state of humans. It is a natural reaction of our organism against what we perceive as a threat –real or imaginary–, and allows us to face difficult situations and survive. However, when it is not associated with a reaction mechanism to face a problem, and it also …

What is the flu?

What is the flu? The flu is a viral infection that affects the respiratory system and is easily spread. A seasonal winter epidemic generally occurs each year, and constitutes a worldwide pandemic every 20 to 30 years, accompanied by a high rate of morbidity and mortality. During the last two centuries there have been six pandemics, in 1900, …

What is dengue and how is it transmitted?

What is dengue and how is it transmitted? The Dengue is an infectious viral disease causes considered a tropical disease. It is transmitted by the bite of the female of a blood-sucking mosquito (which feeds on blood), popularly known as a white-legged mosquito , and whose scientific name is Aedes aegypti . This mosquito lives mainly in urban habitats and fulfills part of …

What is asthma?

What is asthma? The asthma is a chronic respiratory disease, characterized by increased reactivity of the airways smaller caliber called bronchi. This means that when faced with different stimuli such as cold, exercise, or certain substances that produce allergies (called allergens), the bronchi become inflamed and decrease in diameter, closing reversibly. This is the main difference between asthma and chronic bronchitis , …

Colour Blindness

How do we see colors? The human eye is made up of different structures that interact to allow the reception of visual stimuli. One of the components of the eye is the retina , which is located at the back of the eye and is responsible for “projecting” the images (stimuli) that come to it from the …