Body Basics
This is the basic unit of life that makes up the human body.
Cell
This organ pumps blood throughout the body.
Heart
This system breaks down food and absorbs nutrients.
Digestive
These tiny blood vessels allow exchange of materials between blood and tissues.
Capillaries
The respiratory system brings this gas into the body for cells to use.
Oxygen
Cells working together form this level of organization.
Tissue
These vessels carry blood away from the heart.
Arteries
This system uses hormones as chemical messengers.
Endocrine
This structure is the main site of gas exchange in the lungs.
Alveoli
The digestive system provides these two things to the circulatory system for transport to cells.
Nutrients and water (especially nutrients absorbed during digestion)
Tissues working together form these structures.
Organs
These vessels return blood to the heart.
Veins
This system removes wastes and helps maintain the body's internal balance.
Excretory
The bone marrow found inside bones performs this important function.
Blood cell production (hematopoiesis)
Muscles need oxygen and nutrients delivered by this system to support their activity.
Circulatory system
These structures are made of different types of organs working together.
Organ systems
Name the four chambers of the human heart.
Right atrium, right ventricle, left atrium, left ventricle
This system includes the skin and helps protect the body while also contributing to temperature regulation.
Intergumentary
The trachea, lungs, and alveoli are associated with this system.
Respiratory system
The nervous and endocrine systems both help coordinate the body, but one primarily uses electrical signals while the other uses these chemical messengers.
Hormones
Put these in order from simplest to most complex: organ, cell, organ system, tissue.
Cell → tissue → organ → organ system
Explain how arteries, veins, and capillaries differ in their roles.
Arteries carry blood away from the heart; veins return blood toward the heart; capillaries are tiny vessels where exchange occurs.
Identify the system responsible for defense against pathogens and explain why the lymphatic system is important to it.
The lymphatic and immune systems help defend the body against pathogens; the lymphatic system is involved in immune defense and fluid balance.
This system provides support, protects organs, produces blood cells, and works with muscles to allow movement.
Skeletal system
Explain why the body's organ systems cannot be considered completely independent of one another.
Because the systems depend on one another to accomplish functions such as obtaining nutrients and oxygen, transporting materials, removing wastes, coordinating activities, protecting the body, and maintaining the body's overall functioning. Organ Systems work as an interconnected team rather than in isolation.