1. blood vessel with a thick layer of smooth muscle and elastic fibers is
a. a vein
b. an artery
c. a capillary
d. the vena cava
2. the circulatory, or cardiovascular system, is composed of
a. the lungs, heart and brain
b. the lungs, blood vessels and heart
c. the heart, blood and blood pressure
d. the heart, arteries and veins
3. which cells protect the body by engulfing invaders or producing antibodies?
a. red blood cells
b. plasma cells
c. platelets
d. white blood cells
4. capillaries belong to which body system?
a. skeletal
b. nervous
c. digestive
d. circulatory
5. a blood vessel one cell thick for absorption of nutrients and removal of wastes
a. a vein
b. an artery
c. a capillary
d. the pulmonary artery
6. hemoglobin carries oxygen to the body's cells. which systems contains
a. respiratory
b. circulatory
c. nervous
d. endocrine
7. the cells in cardiac muscle would probably have a high number of
a. mrna molecules
b. golgi apparati
c. lysossomes
d. mitochondria
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1. blood vessel with a thick layer of smooth muscle and elastic fibers is
a. a vein
b. an...
a. a vein
b. an...
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