Dysmenorrhea is:

• A. absence of menstruation.
• B. painful or difficult menstruation.
• C. excessive menstruation.
• D. scanty menstrual flow.

The sex glands are the:

• A. spermatozoa.
• B. androgens.
• C. gonads.
• D. glans.

The testes are contained in the:

• A. vas.
• B. ductus deferens.
• C. urethra.
• D. scrotum.

Audition is:

• A. hearing.
• B. tasting.
• C. losing balance.
• D. surgery on the ear.

The main function of erythrocytes is to:

• A. prevent clotting.
• B. carry oxygen.
• C. promote coagulation.
• D. carry out phagocytosis.

The active units of the kidney are the:

• A. alveoli.
• B. nephrons.
• C. sphincters.
• D. cysts.

The tube that carries food into the stomach is the:

• A. esophagus.
• B. jejunum.
• C. pylorus.
• D. pharynx.

The membrane that covers the lungs is the:

• A. turbinate.
• B. phrenic.
• C. pleura.
• D. glottis.

A septum is a:

• A. pointed region of an organ.
• B. pathway through the heart.
• C. dividing wall.
• D. valve.

The endocrine glands secrete

• A. mucus.
• B. serous fluid.
• C. hormones.
• D. saliva.