6 Human Body Facts Most People Do Not Know

Basic human body facts

How many ribs do we have?
We have 12 sets of ribs for a total of 24. The first 7 are called true ribs and are directly attached to the sternum. The next three are attached to the sternum with a common attachment.
The last two are called floating ribs because they are attached to the vertebrae.

ribs anatomy

Where your spleen located?
Your spleen is an important organ that works with the lymphatic system to filter your blood.
The spleen is located under the rib cage and above the stomach in the left upper portion of the abdomen.


What does your liver do?
Your liver is a very large organ that is vital for your health and performs over 200 vital functions.
Here are just a few of the very important functions.
First, the liver produces a substance called bile which is important in digestion.
The liver stores glycogen which is used for energy.
It cleans toxins from your blood.
For example, the liver converts ammonia into urea which can be flushed out in your urine
Your Liver makes cholesterol.


Your left lung is smaller than your right lung.
The left lung is a little smaller than the right lung because it shares space in the left side of the chest with the heart. Your right lung has three sections called lobes and your left lung only has two.


How is a tendon different than a ligament?
A tendon is a connective tissue that connects muscle to bone and a ligament is a connective tissue that connects bone to bone.


How much blood do we have?
The average person has 4.5 to 5.5 liters of blood.
This is around 6 to 6.5 quarts of blood. The blood is made up of plasma, red blood cells, white blood cells, and platelets.

how much blood do we have?

Additional Human Body Facts

Organ Systems of the Human Body

The human body is made up of trillions of cells, which are organized into tissues and organs. Organs are then organized into organ systems, which work together to maintain homeostasis and perform all the functions necessary for life.

The major organ systems of the human body are:

  • Integumentary system
    • Skin, hair, nails
    • Protects the body from the outside world
  • Skeletal system
    • Bones, joints, cartilage
    • Supports the body, protects organs, allows movement
  • Muscular system
    • Muscles
    • Allows movement, maintains posture, produces heat
  • Nervous system
    • Brain, spinal cord, nerves
    • Controls all bodily functions, receives and processes information
  • Endocrine system
    • Glands
    • Produces and releases hormones, which regulate various bodily functions
  • Cardiovascular system
    • Heart, blood vessels, blood
    • Pumps blood throughout the body, delivers oxygen and nutrients to cells, removes waste products
  • Lymphatic system
    • Lymph nodes, lymphatic vessels, lymph
    • Collects and returns fluid to the bloodstream, helps fight infection
  • Respiratory system
    • Lungs, airways
    • Takes in oxygen, removes carbon dioxide
  • Digestive system
    • Mouth, esophagus, stomach, intestines
    • Breaks down food, absorbs nutrients, eliminates waste
  • Urinary system
    • Kidneys, ureters, bladder, urethra
    • Filters blood, produces urine, eliminates waste
  • Reproductive system
    • Male: testes, penis
    • Female: ovaries, uterus, vagina
    • Produces gametes, supports pregnancy, gives birth