Human Body on Facts

How many chambers does the human heart have?

Thu, 05 Nov 2026 00:00:00 +0000

Your heart is about the size of a fist, and it beats roughly 100,000 times a day. Inside, it works as two pumps sitting side by side, each with two rooms.

How much protein do you need a day?

Thu, 05 Nov 2026 00:00:00 +0000

Protein needs are based on body weight, not on a single number for everyone. The official figure is a minimum to meet basic needs for most healthy adults, set by the US National Academies and used by health agencies.

How to lower cholesterol

Thu, 05 Nov 2026 00:00:00 +0000

Cholesterol is a waxy substance your body needs to build cells and make hormones. Problems start when too much of one kind builds up in the arteries.

How to meditate for beginners

Thu, 05 Nov 2026 00:00:00 +0000

Types of meditation to try

Type	What you do
Breath focus	Keep your attention on breathing, as above
Body scan	Move your attention slowly from your toes to your head, noticing sensations
Mindfulness	Observe thoughts, sounds and feelings without judging them
Loving-kindness	Silently repeat kind wishes for yourself and others
Walking meditation	Walk slowly and pay attention to each step

Guided recordings and apps can help at the start, since a voice reminds you what to focus on.

How to sleep better

Thu, 05 Nov 2026 00:00:00 +0000

Better sleep usually comes from a handful of boring habits, repeated every day. None of them work overnight, but together they help your body clock settle into a steady rhythm.

What is ADHD?

Thu, 05 Nov 2026 00:00:00 +0000

Everyone gets distracted or restless sometimes. With ADHD, these patterns are persistent, start early in life, and cause real difficulties at school, work or home.

The three presentations

Type	What it mainly involves
Predominantly inattentive	Trouble focusing, organizing, finishing tasks; often losing things
Predominantly hyperactive-impulsive	Fidgeting, restlessness, interrupting, acting without thinking
Combined	A mix of both, the most common presentation

Common signs

Difficulty keeping attention on tasks or conversations
Being easily distracted and forgetful in daily activities
Trouble organizing time and belongings
Fidgeting, or feeling restless inside, especially in adults
Talking a lot, interrupting or finding it hard to wait

In adults, hyperactivity often looks less like running around and more like inner restlessness, procrastination and difficulty managing time.

What is COPD?

Thu, 05 Nov 2026 00:00:00 +0000

Breaking down the name

Word	Meaning
Chronic	Long-lasting
Obstructive	The airways are narrowed, so air flows out more slowly
Pulmonary	Relating to the lungs
Disease	A medical condition

The two main forms

Emphysema: The tiny air sacs in the lungs are damaged, so less oxygen gets into the blood.
Chronic bronchitis: The airways stay inflamed and produce extra mucus, causing a long-lasting cough.

Many people have features of both.

What is gout?

Thu, 05 Nov 2026 00:00:00 +0000

Uric acid is a normal waste product your body makes when it breaks down substances called purines, found in your own cells and in some foods. Usually your kidneys get rid of it. If the body makes too much or the kidneys remove too little, levels rise and crystals can form.

What is hypertension?

Thu, 05 Nov 2026 00:00:00 +0000

What the two numbers mean

A reading such as 120/80 mmHg has two parts:

Number	Name	What it measures
Top (120)	Systolic	Pressure when the heart beats
Bottom (80)	Diastolic	Pressure when the heart rests between beats

Guidelines for what counts as “high” differ slightly between countries. In the US, readings of 130/80 or higher are generally considered high. In the UK, the threshold is usually 140/90 in a clinic. A doctor decides based on several readings, not one.

What is ketamine?

Thu, 05 Nov 2026 00:00:00 +0000

Ketamine was first made in 1962 and approved for medical use in the US in 1970. It became widely used on battlefields and in emergency medicine because it relieves pain and causes anesthesia without slowing breathing as much as many other anesthetics. The World Health Organization lists it as an essential medicine.

What is Lewy body dementia?

Thu, 05 Nov 2026 00:00:00 +0000

Lewy bodies are named after Friedrich Lewy, the German neurologist who first described them in the early 1900s. LBD is one of the most common causes of dementia after Alzheimer’s disease, and it’s often misdiagnosed at first.

What is lupus?

Thu, 05 Nov 2026 00:00:00 +0000

Normally, your immune system protects you from germs. In lupus, it can’t tell the difference between invaders and your own cells, so it produces antibodies that attack healthy tissue.

Common signs

Lupus is sometimes called “the great imitator” because its symptoms vary so much and can look like other conditions. Common ones include:

What is MS (multiple sclerosis)?

Thu, 05 Nov 2026 00:00:00 +0000

Think of myelin as the insulation on an electrical wire. When it’s damaged, signals along the nerve slow down, get scrambled or stop. “Sclerosis” means scarring, and the name refers to the many patches of scar tissue (lesions) that form.

What is POTS?

Thu, 05 Nov 2026 00:00:00 +0000

Breaking down the name

Word	Meaning
Postural	Related to body position
Orthostatic	Upright, standing
Tachycardia	A fast heart rate
Syndrome	A group of symptoms that occur together

What happens in POTS

When anyone stands, gravity pulls blood toward the legs. The autonomic nervous system, which controls automatic functions like heart rate and blood pressure, normally adjusts within seconds. In POTS, this adjustment doesn’t work properly, so the heart beats much faster to compensate.

What is RSV?

Thu, 05 Nov 2026 00:00:00 +0000

Almost every child catches RSV at least once by the age of two, and people can catch it again throughout life. In many countries it spreads most in autumn and winter.

What is sepsis?

Thu, 05 Nov 2026 00:00:00 +0000

Sepsis is not an infection itself. It’s the body’s extreme reaction to one. An infection in the lungs, urinary tract, skin or gut can trigger it, and it’s caused most often by bacteria, though viruses and fungi can also lead to sepsis.