Tissues are a step up from cells in terms of complexity. A tissue is described as a collection of many related cells connected by different quantities and types of nonliving intercellular matter.
Organs are more complex than tissues in terms of structure. An organ is a collection of various tissues that are organised in such a way that they can serve a certain purpose when combined. The stomach, for example, is made up of muscle, connective, epithelial, and nervous tissues. Its shell is made up of muscle and connective tissues, its lining is made up of epithelial and connective tissues, and nervous tissue runs in both the wall and the lining.
The most complex of the human body’s constituent units are systems. A system is a set of organs of various sizes and types that are organised in such a way that they can perform complex roles for the body as a whole.
Brain Stimulate the brain to learn how this amazing, complex organ serves as the body’s primary control centre.
This muscle, the body’s hardest-working organ, is responsible for every cell in the body.
System of digestion
Feed the body various foods to see how this mechanism functions as the body’s fuel factory.
Lungs Discover how the lungs supply life’s oxygen to see how asthma can be crippling.
How the body’s largest organ is affected by ageing and pressures such as wounds and sunlight.
The human body systems
Different organs may collaborate to perform a common task, such as breaking down food in the digestive system. An organ system is what we call an interconnected unit. Organ systems work together to form complete, functioning entities such as ourselves! In the human body, there are 11 main organ systems.