how many system in human body

There are 11 main systems in the human body as usually taught in school and medical basics.

Quick Scoop: Human Body Systems

Most anatomy books group the body into 11 major organ systems that work together to keep you alive and in balance (homeostasis).

The 11 major systems

Here are the commonly listed 11 systems:

1. Integumentary system (skin, hair, nails, glands).

2. Skeletal system (bones, joints, cartilage).

3. Muscular system (all body muscles).

4. Nervous system (brain, spinal cord, nerves, sense organs).

5. Endocrine system (hormone‑producing glands, e.g., thyroid, adrenal, pituitary).

6. Cardiovascular / circulatory system (heart, blood, blood vessels).

7. Lymphatic / immune system (lymph nodes, spleen, thymus, lymph vessels, immune cells).

8. Respiratory system (lungs, airways like trachea, bronchi).

9. Digestive / gastrointestinal system (mouth to intestines, liver, pancreas, etc.).

10. Urinary / excretory system (kidneys, ureters, bladder, urethra).

11. Reproductive system (male and female reproductive organs).

Small twist: 10 vs 11 (why some books differ)

Some experts combine the skeletal and muscular systems into one musculoskeletal system, and then they say there are 10 systems instead of 11. A few classifications also treat certain exocrine glands separately, which is why you might sometimes see mentions of “11–12” systems, but the standard school answer is 11 body systems.

Simple HTML table version

Since you asked in a way that looks like it might be for a post, here’s an HTML table you can drop into a page:

html

<table>
  <thead>
    <tr>
      <th>System</th>
      <th>Also called</th>
      <th>Main role (very short)</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Integumentary</td>
      <td>–</td>
      <td>Protects body, helps control temperature.</td>
    </tr>
    <tr>
      <td>Skeletal</td>
      <td>–</td>
      <td>Supports body, protects organs, helps movement.</td>
    </tr>
    <tr>
      <td>Muscular</td>
      <td>–</td>
      <td>Enables movement and posture.</td>
    </tr>
    <tr>
      <td>Nervous</td>
      <td>–</td>
      <td>Controls and coordinates body activities.</td>
    </tr>
    <tr>
      <td>Endocrine</td>
      <td>Hormone system</td>
      <td>Regulates body functions via hormones.</td>
    </tr>
    <tr>
      <td>Cardiovascular</td>
      <td>Circulatory</td>
      <td>Transports blood, oxygen, nutrients.</td>
    </tr>
    <tr>
      <td>Lymphatic</td>
      <td>Immune</td>
      <td>Defends against infection, returns fluid to blood.</td>
    </tr>
    <tr>
      <td>Respiratory</td>
      <td>–</td>
      <td>Exchanges oxygen and carbon dioxide.</td>
    </tr>
    <tr>
      <td>Digestive</td>
      <td>Gastrointestinal</td>
      <td>Breaks down food, absorbs nutrients.</td>
    </tr>
    <tr>
      <td>Urinary</td>
      <td>Excretory</td>
      <td>Removes waste, balances fluids.</td>
    </tr>
    <tr>
      <td>Reproductive</td>
      <td>–</td>
      <td>Enables reproduction.</td>
    </tr>
  </tbody>
</table>

Mini TL;DR

• Standard teaching: 11 systems in the human body.

• Some authors merge skeletal + muscular into one, so they say 10, but 11 is the widely accepted school/college answer.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.