Glencoe Biology

Section 1: Circulatory System

Self-Check Quizzes

1
Which of these is not part of the structure of arteries?
A)fibrin
B)connective tissue
C)smooth muscle
D)endothelial tissue
2
A group of cells called the ____ causes the heart to contract.
A)vena cava
B)atrium
C)pacemaker
D)platelet
3
This figure shows the two circulatory loops in which blood flows. What occurs when blood from the lungs enters the left atrium?
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A)blood flows directly into veins
B)first circulatory loop begins
C)blood is deoxygenated
D)second circulatory loop begins
4
How do platelets form blood clots?
A)by producing white blood cells
B)by producing fibrin
C)by by releasing carbon dioxide
D)by destroying red blood cells
5
What causes oxygen to diffuse from the lungs into the capillaries?
A)equal oxygen concentration in lungs and capillaries
B)oxygen concentration is lower in lungs
C)oxygen concentration is lower in capillaries
D)blood from pulmonary arteries is high in oxygen
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