Human Body Systems

The mouth is where food is mechanically broken down by chewing and mixed with saliva, but digestion primarily occurs in the stomach and intestines.

The respiratory system includes the nose, mouth, trachea, bronchi, and lungs.

The rib cage protects vital organs such as the lungs and heart.

The circulatory system cycles blood throughout the body to deliver oxygen and nutrients to cells.

Transport refers to the movement of materials, such as oxygen and nutrients, throughout the body.

The lungs are responsible for gas exchange, allowing oxygen to enter the blood and carbon dioxide to be expelled.

The heart pumps blood throughout the body, supplying oxygen and nutrients to tissues.

The digestive system breaks down food to extract nutrients, while the respiratory system is responsible for breathing and gas exchange.

Respiration is the process of inhaling oxygen and exhaling carbon dioxide, essential for cellular energy production.

The main components include the mouth, esophagus, stomach, intestines, liver, and pancreas.