Exploring Body Systems and Cells

The main purpose of homeostasis is to...

• Fight disease-causing organisms

• Keep internal conditions stable

• Produce offspring

• Replicate DNA

Which organ system is responsible for transporting oxygen and nutrients throughout the body?

• Digestive system

• Circulatory system

• Nervous system

• Skeletal system

What is the basic unit of life according to cell theory?

• Tissue

• Organ

• Cell

• Organ system

Which of the following is NOT one of the major human organ systems?

• Respiratory system

• Skeletal system

• Photosynthetic system

• Muscular system

Which principle is part of the cell theory?

• All cells have a nucleus

• All living things are made of cells

• Only animals are made of cells

• Cells can only be seen with a microscope

Which function is performed by nerve cells in the human body?

• Transporting oxygen

• Sending electrical signals

• Producing hormones

• Breaking down food

Directs all cell activities through the DNA located there.

• Lysosomes
• Nucleus
• ribosomes
• Mitochondria

Which organ system helps maintain homeostasis by removing waste products from the blood?

• Digestive system

• Excretory system

• Endocrine system

• Integumentary system

Which of the following best describes the function of muscle tissue?

• Protects the body from pathogens

• Contracts to produce movement

• Transmits electrical impulses

• Stores fat

How does the respiratory system work together with the circulatory system?

• By digesting food

• By exchanging gases and transporting oxygen to cells

• By producing hormones

• By supporting the body structure