How many amino acids are present for a polypeptide chain to be called a protein?

A. 50
B. 3
C. 100
D. 30


Answer: C

Anatomy & Physiology

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Which of the following is not secreted by helper T cells?

a. B-cell growth factor b. T-cell growth factor c. interleukin 1 d. interleukin 2 e. macrophage migration inhibition factor

Anatomy & Physiology

Contraction of the ________ layers of the intestinal wall functions to both agitate materials and propel them along the digestive tract.

A) mucosa B) submucosa C) serosa D) muscularis externa E) adventitia

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The viscosity of blood is ________ proportional to the number of erythrocytes and ________ proportional to the amount of fluid.

A. directly; indirectly B. indirectly; directly C. directly; directly D. indirectly; indirectly

Anatomy & Physiology

Which blood vessel drains deoxygenated blood from the portion of the body below the chest?

A. Subclavian vein B. Superior vena cava C. Inferior vena cavae D. Aorta

Anatomy & Physiology