Biology 40 The Circulatory System MCQ


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Photo depicts Earth from space.
This NASA image is a composite of several satellite-based views of Earth. To make the whole-Earth image, NASA scientists combine observations of different parts of the planet. (credit: NASA/GSFC/NOAA/USGS)

Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.

Unit 7. Animal Structure and Function

Chapter 40: The Circulatory System MCQ Multiple Choices Questions Quiz Test Bank

40.1 Overview of the Circulatory System

40.2 Components of the Blood

40.3 Mammalian Heart and Blood Vessels

40.4 Blood Flow and Blood Pressure Regulation

Quiz PDF eBook: 
Biology 40 The Circulatory System MCQ
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Sample Questions from the Biology 40 The Circulatory System MCQ Quiz

Question: During the systolic phase of the cardiac cycle, the heart is ________.




contracting and relaxing

filling with blood

Question: In humans, the plasma comprises what percentage of the blood?


45 percent

55 percent

25 percent

90 percent

Question: How do arteries differ from veins?


Arteries have thicker smooth muscle layers to accommodate the changes in pressure from the heart.

Arteries carry blood.

Arteries have thinner smooth muscle layers and valves and move blood by the action of skeletal muscle.

Arteries are thin walled and are used for gas exchange.

Question: Cardiomyocytes are similar to skeletal muscle because:


they beat involuntarily

they are used for weight lifting

they pulse rhythmically

they are striated

Question: Why are open circulatory systems advantageous to some animals?


They use less metabolic energy.

They help the animal move faster.

They do not need a heart.

They help large insects develop.

Question: The red blood cells of birds differ from mammalian red blood cells because:


they are white and have nuclei

they do not have nuclei

they have nuclei

they fight disease

Question: Platelet plug formation occurs at which point?


when large megakaryocytes break up into thousands of smaller fragments

when platelets are dispersed through the blood stream

when platelets are attracted to a site of blood vessel damage

none of the above

Question: White blood cells:


can be classified as granulocytes or agranulocytes

defend the body against bacteria and viruses

are also called leucocytes

All of the above

Question: The heart's internal pacemaker beats by:


an internal implant that sends an electrical impulse through the heart

the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node

the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node

the action of the sinus

Question: Some animals use diffusion instead of a circulatory system. Examples include:


birds and jellyfish

flatworms and arthropods

mollusks and jellyfish

None of the above

Question: Blood flow that is directed through the lungs and back to the heart is called ________.


unidirectional circulation

gill circulation

pulmonary circulation

pulmocutaneous circulation

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