human body systems

The main function of the respiratory system is to take in oxygen and exhale waste like carbon dioxide.

A vaccine helps the immune system by placing a weakened form of the pathogen into a human so the body can learn to recognize it.

1. Cell 2. Tissue 3. Organ 4. Organ System 5. Organism

The immune system mass produces antibodies to mark pathogens for destruction.

Lungs are part of the respiratory system.

The circulatory system's role is to move nutrients, gases, hormones, and waste products throughout the body.

Homeostasis is the process by which the body maintains a stable internal environment despite changes in external conditions.

Red blood cells transport oxygen from the lungs to the body's tissues and carry carbon dioxide back to the lungs.

The primary function of the digestive system is to break down food into nutrients that the body can use.

The nervous system processes information and coordinates the body's responses to internal and external stimuli.