Human Body Systems and Functions Quiz

What is the smallest unit of life in the human body?

• Tissue

• Cell

• Organ

• System

Answer explanation

The smallest unit of life in the human body is the cell. Cells are the basic building blocks that make up all living organisms, including tissues, organs, and systems, which are all composed of cells.

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NGSS.MS-LS1-1

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Which of the following is a group of similar cells that work together to perform a specific function?

• Organ

• System

• Tissue

• Organism

Answer explanation

Tissue is a group of similar cells that work together to perform a specific function, such as muscle tissue contracting to enable movement. In contrast, organs are made of different tissues, and systems consist of multiple organs.

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What is formed when different tissues work together to perform a specific function?

• Cell

• Organ

• System

• Organism

Answer explanation

An organ is formed when different tissues work together to perform a specific function, such as the heart or liver. This distinguishes it from cells, systems, and organisms, which are broader or more complex structures.

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NGSS.MS-LS1-3

Which level of organization is made up of different organs working together?

• Tissue

• Cell

• System

• Organism

Answer explanation

The correct answer is 'System' because a system is composed of different organs that work together to perform complex functions, unlike tissues, cells, or organisms which represent different levels of biological organization.

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NGSS.MS-LS1-3

What is the highest level of organization in the human body?

• Organ

• System

• Tissue

• Organism

Answer explanation

The highest level of organization in the human body is the organism. It encompasses all systems, organs, and tissues, functioning as a complete living entity.

Which system of the human body is responsible for breaking down food into nutrients?

• Respiratory

• Circulatory

• Digestive

• Nervous

Answer explanation

The digestive system is responsible for breaking down food into nutrients that the body can absorb and use for energy, growth, and cell repair. The other systems listed do not perform this function.

Which system is responsible for transporting oxygen and nutrients to cells?

• Muscular

• Skeletal

• Circulatory

• Digestive

Answer explanation

The circulatory system is responsible for transporting oxygen and nutrients to cells throughout the body, ensuring they receive the necessary substances for energy and function.

Which system allows the body to move and maintain posture?

• Nervous

• Muscular

• Digestive

• Respiratory

Answer explanation

The muscular system is responsible for movement and maintaining posture in the body. It works in conjunction with the nervous system to coordinate actions, but the primary function of movement is carried out by the muscles.

Which system provides support and protection for the body?

• Skeletal

• Circulatory

• Nervous

• Digestive

Answer explanation

The skeletal system provides support and protection for the body by forming the framework that supports organs and tissues, while also protecting vital structures like the brain and heart.

Which system is responsible for controlling and coordinating body activities?

• Respiratory

• Nervous

• Muscular

• Skeletal

Answer explanation

The nervous system is responsible for controlling and coordinating body activities by transmitting signals between different parts of the body, making it essential for response to stimuli and maintaining homeostasis.