Chapter 50: Circulatory Systems

 

Complete Chapter Questions With Answers

 

Sample Questions Are Posted Below

 

Multiple Choice

 

1. A cardiovascular system is not necessary in the hydra because the hydra
2. is an aquatic animal.
3. has no skeleton.
4. is only two cells thick.
5. has tentacles to move water.
6. does not move rapidly.

Answer: c

Textbook Reference: 50.1 Why Do Animals Need a Circulatory System?

Page: 1046

Bloom’s Category: 2. Understanding

 

2. Which of the following statements about gastrovascular cavities is false?
3. Organisms with gastrovascular cavities tend to be only a few cells thick.
4. Gastrovascular cavities are always highly branched.
5. Gastrovascular cavities are filled with interstitial fluid.
6. The diffusion path length in organisms with gastrovascular cavities is usually short.
7. Large organisms do not usually have gastrovascular cavities.

Answer: c

Textbook Reference: 50.1 Why Do Animals Need a Circulatory System?

Page: 1046

Bloom’s Category: 2. Understanding

 

3. Which of the following statements about open circulatory systems is false?
4. A pump is usually present.
5. Blood is pumped out of openings in the heart called ostia.
6. The blood is the interstitial fluid.
7. Tissue fluid bathes the tissues directly.
8. Many mollusks and all arthropods have open circulatory systems.

Answer: b

Textbook Reference: 50.1 Why Do Animals Need a Circulatory System?

Page: 1046

Bloom’s Category: 1. Remembering

 

4. Some large, multicellular, aquatic animals have no circulatory system. They manage gas exchange
5. by bringing the external environment (with its supply of oxygen) inside their body.
6. by means of endosymbiotic bacteria that produce oxygen inside their tissues.
7. solely by diffusion from outside their bodies.
8. by basking at the surface periodically to allow for diffusion of oxygen.
9. None of the above

Answer: a

Textbook Reference: 50.1 Why Do Animals Need a Circulatory System?

Page: 1046

Bloom’s Category: 2. Understanding

 

5. Which of the following is not transported through a closed circulatory system?
6. Heat
7. Respiratory gases
8. Gametes
9. Hormones
10. All of the above are transported through closed circulatory systems.

Answer: c

Textbook Reference: 50.1 Why Do Animals Need a Circulatory System?

Page: 1046

Bloom’s Category: 1. Remembering