MCA Review (Page 13) Structure & Function of Living Things

What is the smallest unit of all living things?

• Atoms

• Cells

• Molecules

• DNA

• Organisms

Answer explanation

Nothing smaller than a cell is considered living because it doesn't meet these 6 criteria:
1. Uses Energy

2. Reproduce (viruses don't count because they require the host's cells for more than energy)

3. 3. Responds to Stimuli (inside and outside)

4. 4. Has levels of organization

5. 5. Grows and Develops

6. 6. Made of Cells

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Are all cells exactly alike?

• Yes, all cells are identical.

• No, cells are specialized to perform certain functions.

• Yes, all cells perform the same functions.

• No, all cells are unspecialized.

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How are living things organized? List the order starting with cells.

• Cells, Tissues, Organs, Organ Systems, Organism

• Cells, Organs, Tissues, Organ Systems, Organism

• Cells, Organ Systems, Tissues, Organs, Organism

• Cells, Tissues, Organ Systems, Organs, Organism

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What is the primary function of the respiratory system?

• Circulation of blood

• Digestion of food

• Exchanging CO₂ for O₂

• Excretion of waste

Which of the following is NOT a part of the respiratory system?

• Lungs

• Trachea

• Liver

• Nose

What is the primary function of the circulatory system?

• To transport hormones throughout the body

• To transport O₂ and nutrients to every cell of the body

• To interpret signals and control other organ systems

• To protect the body from diseases

• To transport CO₂ back to the lungs

Answer explanation

The primary function of the circulatory system is to transport hormones, O2, and nutrients to every cell of the body, as well as transport CO2 back to the lungs.

Which organs are involved in the circulatory system?

• Heart, lungs, arteries, veins

• Heart, stomach, veins, capillaries

• Kidneys, heart, lungs, arteries

• Brain, heart, arteries, veins

What is the primary function of the digestive system?

• To circulate blood

• To break down and absorb nutrients

• To control body temperature

• To support body movement

Which of the following is not a part of the digestive system?

• Heart

• Esophagus

• Stomach

• Small intestine

What is the primary function of the nervous system?

• To pump blood throughout the body

• To digest food

• To communicate messages between the brain and body

• To protect the body from diseases