What is responsible for keeping blood vessels partially constricted at all times?
A) sympathetic tone
B) somatic control
C) parasympathetic tone
D) cerebral cortex control
Answer: A
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Erythrocytes exhibit a limited lifespan due to their inability to synthesize the proteins necessary to repair themselves.
Answer the following statement true (T) or false (F)
A tissue that provides strength and support for areas subjected to stresses from many directions is
A) any connective tissue proper. B) elastic or hyaline cartilage. C) dense irregular connective tissue. D) reticular connective tissue. E) dense regular connective tissue.
Which vitamin is essential for the absorption of calcium and phosphorus from the GI tract?
a) A b) D c) E d) K e) C
What are the three main components of the circulatory system?
a. heart, arteries, and veins b. heart, blood, and lymph c. heart, blood vessels, and blood d. heart, blood vessels, and lungs e. smooth muscle, blood, and blood vessels