Investigating Circulation: What Is the Circulatory System?

The video explains how living organisms transport nutrients, gases, and waste. Simple organisms like amoebas have direct contact with their environment, while complex organisms like elk require a circulatory system. This system, consisting of blood, tissues, and organs, connects cells to the environment. Blood vessels and the heart play crucial roles in circulating blood throughout the body.

What is the primary function of transport in living organisms?

• To move substances into and out of cells

• To provide energy to cells

• To replicate cells

• To protect cells from damage

Why do complex vertebrate animals require a circulatory system?

• To directly contact the environment

• To move materials to cells throughout the body

• To produce nutrients

• To eliminate the need for blood

What is one of the main functions of blood in the circulatory system?

• To store energy

• To transport nutrients and gases

• To create new cells

• To digest food

What are the small, tube-like structures that carry blood throughout the body called?

• Veins

• Nerves

• Blood vessels

• Arteries

Which organ is responsible for pumping blood through the blood vessels?

• Lungs

• Liver

• Heart

• Kidneys