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Public Health and Safety
Ask questions about disease and infections in society and how to cure and prevent outbreaks.
4,000 Questions
No, bacteria do not have mouths like animals do. Instead, they absorb nutrients through their cell wall or membrane. Bacteria use various methods to obtain nutrients, such as secreting enzymes to break down molecules in their environment and then absorbing the smaller components.
Why are people against cloning?
Some people are worried that cloning technology might eventually be used for immoral purposes. People might, in theory, be mass-produced as slaves or soldiers. People could be cloned as a source of spare organs for the wealthy.
How Is Air Inhaled Air Different To Exhaled Air?
It is because, once the air is inhaled, the lungs absorb the oxygen in the air and releases only the remaining stale air.
The air that goes in has a higher % of Oxygen and the air that comes out has a higher % of Carbon di oxide.
The sodium-potassium pump usually pumps?
The sodium-potassium pump usually pumps three sodium ions out of the cell and two potassium ions into the cell against their concentration gradients using ATP as energy. This helps maintain the cell's resting membrane potential and is important for nerve and muscle function.
What is the function of the macula in the human eye?
The macula is a small area -- less than ¼ inch -- in the center of the retina at the back of the eye .It is responsible for sharp, clear central vision and the ability to perceive color.
How does the macula function?Like the film in a camera, the retina receives light rays from the front of the eye and transmits those light rays through the optic nerve to the brain where the rays are converted into images. The densely packed photoreceptor (light-sensitive) cells in the macula control all of the eye's central vision and are responsible for the ability to read, drive a car, watch television, see faces, and distinguish detail. The rest of the retina handles peripheral vision that enables your eyes to see objects off to the side while you are looking forward.There are two types of photoreceptor cells in the cornea -- rods and cones. The rods provide vision at low light levels, while the cones provide sharp vision and discrimination. Because the macula contains a high concentration of cones, straight-ahead vision is in sharp focus, particularly in bright light. Most of the rods are located in the periphery of the retina, so faint objects are more visible if you do not look directly at them. A dim star, for instance, is best seen when your eyes are not aimed directly at it.
What problems can occur with the macula?The most common cause of functional blindness in people over the age of 60 is macular degeneration, a deterioration or breakdown of the macula. Damage to the macula results in the loss, either partial or complete, of ability to see objects clearly in the center of vision. Although not totally blind, the person has difficulty performing tasks that require "straight-on" vision, such as driving a car, reading, or watching television. Because peripheral vision is not affected, the person can adapt somewhat to the loss of central vision and continue to pursue some normal daily activities, such as walking, without assistance.There are two types of macular degeneration. The "dry" form is usually the result of aging and thinning of the macula's layers, and the "wet" form occurs when abnormal blood vessels under the retina leak fluid and blood, causing scarring. Vision loss with dry macular degeneration occurs gradually over a number of years, and the affected person may not be aware of any problem. Dry macular degeneration is the less serious of the two forms. With the wet form of this disease, central vision capabilities can be damaged rapidly. Early detection usually results in more successful treatment.
What is Visible light only a small portion of?
Visible light is only a small portion of the electromagnetic spectrum, which includes a wide range of wavelengths such as radio waves, microwaves, infrared, ultraviolet, X-rays, and gamma rays.
What is the abundant substance in the body?
Water is the most abundant substance in the human body, making up about 60% of an adult's body weight. It plays a crucial role in many bodily functions, including temperature regulation, nutrient transport, and waste removal.
How many meters are there in 4 feet 10 inches?
Algebraic Steps / Dimensional Analysis Formula4 ft*
12 in
1 ft
*
2.54 cm
1 in
*
1 m
100 cm
=
1.2192 m
Direct Conversion Formula 4 ft*
0.3048 m
1 ft
=
1.2192 m
4 feet 0 inches = 1.2192 meters
One foot is equal to 0.3048 metres. Therefore, 4 feet is equal to 4 x 0.3048 = 1.2192 metres.
What two inputs are needed for cellular respiration?
The two inputs needed for cellular respiration are glucose (sugar) and oxygen. Glucose is broken down in the presence of oxygen to produce energy in the form of ATP, which is used by cells for various functions. Oxygen is the final electron acceptor in the electron transport chain, a crucial step in generating ATP.
What is normal blood temperature?
Normal blood temperature is around 98.6 degrees Fahrenheit or 37 degrees Celsius. It is important for maintaining the body's metabolic processes and overall health. Variations from this temperature can be a sign of illness or other health issues.
Why are people worried about cloning?
Because they don't understand it. It is a complex issue, surrounded on all sides by ignorant people with imaginary axes to grind, and a wonderful way to distract people from the real problems we face.
What are the symptoms of hantavirus?
Hantavirus has an incubation time of 2–4 weeks in humans, before symptoms of infection occur. These symptoms can be split into five phases: Febrile phase: Symptoms include fever, chills, malaise, headaches, nausea, abdominal and back pain, respiratory problems such as the ones common in the influenza virus, as well as gastro-intestinal problems. These symptoms normally occur for 3–7 days. Hypotensive phase: This occurs when the blood platelet levels drop and symptoms can lead to tachycardia and hypoxemia. This phase can last for 2 days. Oliguric phase: This phase lasts for 3–7 days and is characterised by the onset of renal failure and proteinuria occurs. Diuretic phase: This is characterized by diuresis of 3–6L per day, which can last for a couple of days up to weeks. Convalescent phase: This is normally when recovery occurs and symptoms begin to improve.
Minimum safe distance from depleted uranium?
Depleted uranium is not so dangerous in metallic form. The external irradiation is minimal - because the alpha radiation is retained by some centimeters of air. The gamma radiation has a small energy (max. 185 keV) and a simple shield is sufficient.
Of course, for detailed data measurements of dose are necessary.
No we are not batteries, personaly I don't know specificly but I just know we are defenetly not batteries
YEAH WE ARE!!!!!!! HAMSTER WHEEL+ FAT PERSON+ TWEENKY= ENOUGH ENERGY TO POWER A SCHOOL!!!
How much bacteria is on the hands after you wash?
After washing hands, the number of bacteria present is reduced significantly. However, not all bacteria are completely eliminated. Some bacteria may still remain on the hands after washing due to factors such as incomplete removal or regrowth.
How often dose an average person smile?
When happy or exilerated from dreaming of hopes or living it out???
Because the cornea is as smooth and clear as glass but is strong and durable, it helps the eye in two ways 1. It helps to shield the rest of the eye from germs, dust, and other harmful matter. The cornea shares this protective task with the eyelids, the eyesocket, tears, and the sclera, or white part of the eye 2. The cornea acts as the eye's outermost lens. It functions like a window that controls and focuses the entry of light into the eye. The cornea contributes between 65-75 percent of the eye's total focusing power. When light strikes the cornea, it bend-or retracts-the incoming light onto the lens. The lens further refocuses that light into the retina, a layer of light sensing cells lining the back of the eye that starts the translation of light into vision. For you to see clearly, light rays must be focused by the cornea and lens to fall precisely on the retina. The retina converts the light rays into impulses that are sent through the optic nerve to the brain, which interprets them as images
Short- term aid is given during or immediately after disasters such as earthquakes, floods or wars. It brings help quickly to people affected by the disaster.
EX. of short term aid: food, medical supplies, books, tents, blankets and clothes.
How is thorium used in the human body?
Thorium is not used in the human body. While thorium is a naturally occurring element, it is not essential for human health and can be harmful if ingested or inhaled, as it is radioactive. It is primarily used in industrial and energy applications.
What are the positives and negatives of uranium?
Applications of uranium:
- nuclear fuel for nuclear power reactors
- explosive for nuclear weapons
- material for armors and projectiles
- catalyst
- additive for glass and ceramics (to obtain beautiful green colors)
- toner in photography
- mordant for textiles
- shielding material (depleted uranium)
- ballast
- and other minor applications
Disadvantages of uranium:
1. Uranium is a possible polluting agent of the natural environment.
2. Uranium is a toxic and radioactive chemical element.
3. Uranium release radium and radon.
Examples of incomplete proteins?
Examples of incomplete proteins include beans, rice, lentils, nuts, and seeds. These proteins lack one or more essential amino acids needed by the body. To get all essential amino acids, it's important to combine incomplete proteins throughout the day.
The abducens nerve (cranial nerve VI) controls the lateral rectus muscle of the eye, which is responsible for abducting (moving the eye away from the nose) the eye. Dysfunction of the abducens nerve can result in horizontal double vision (diplopia) and difficulty moving the affected eye laterally.
What will happen if you swallow a rock?
Swallowing a small rock typically passes through the digestive system without causing harm. However, swallowing larger rocks can lead to blockages in the digestive tract requiring medical intervention. It's important to seek medical attention if you've swallowed a rock to assess the situation and prevent any complications.
What is the effect of thorium to the human body?
1. The external irradiation from thorium is not so important.
2. Inhalation or ingestion of thorium is dangerous because thorium is radioactive (it is an alpha emitter) and also release radon by decay.
