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1.1 The study of life Read Online
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.
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
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Question: Some animals use diffusion instead of a circulatory system. Examples include:
Choices:
birds and jellyfish
flatworms and arthropods
mollusks and jellyfish
None of the above
Question: Cardiomyocytes are similar to skeletal muscle because:
Choices:
they beat involuntarily
they are used for weight lifting
they pulse rhythmically
they are striated
Question: How do arteries differ from veins?
Choices:
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: White blood cells:
Choices:
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:
Choices:
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: Platelet plug formation occurs at which point?
Choices:
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: In humans, the plasma comprises what percentage of the blood?
Choices:
45 percent
55 percent
25 percent
90 percent
Question: During the systolic phase of the cardiac cycle, the heart is ________.
Choices:
contracting
relaxing
contracting and relaxing
filling with blood
Question: Why are open circulatory systems advantageous to some animals?
Choices:
They use less metabolic energy.
They help the animal move faster.
They do not need a heart.
They help large insects develop.
Question: Blood flow that is directed through the lungs and back to the heart is called ________.
Choices:
unidirectional circulation
gill circulation
pulmonary circulation
pulmocutaneous circulation
Question: The red blood cells of birds differ from mammalian red blood cells because:
Choices:
they are white and have nuclei
they do not have nuclei
they have nuclei
they fight disease
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