CHAPTER 10.1 (F4): THE CIRCULATORY SYSTEM IN ORGANISMS

Why do unicellular organisms like Amoeba not require a specialized transport system?

• They have a small surface area to volume ratio.

• They have a large surface area to volume ratio.

• They have simple internal structures.

What is a challenge faced by large complex multicellular organisms in obtaining essential substances?

• They have a large surface area to volume ratio.

• The external environment is too far from the cells.

• They can easily exchange substances by diffusion.

What is the main function of the blood circulatory system in vertebrates?

• To provide structural support

• To facilitate movement

• To transport nutrients and oxygen

• To produce energy

In an open circulatory system, where does the haemolymph flow?

• Inside closed blood vessels

• Directly into the hemocoel

• Through the lymphatic system

• Within the nervous system

What is a key characteristic of a closed circulatory system?

• Blood flows freely in the body cavity

• Blood is contained in a continuous closed vessel

• Haemolymph bathes the cells directly

• Nutrients are absorbed through the skin

What is haemolymph?

• A type of blood cell

• A blood-like nutritious liquid

• A digestive enzyme

• A type of nerve cell

What type of circulatory system do insects have?

• Closed circulatory system

• Open circulatory system

• Single circulatory system

• Double circulatory system

In the circulatory system of insects, what is the function of ostium?

• To pump blood into the aorta

• To allow haemolymph to flow back into the heart

• To exchange gases with the environment

• To transport oxygenated blood to tissues

How many chambers does the heart of a fish have?

• One

• Two

• Three

• Four

What is the role of gill capillaries in the circulatory system of fish?

• To pump blood to the heart

• To enable gaseous exchange

• To transport nutrients to tissues

• To store oxygen