This figure shows an intestinal villus. What is the structure indicated by the number 1?
A. Intestinal vein
B. Intestinal artery
C. Flagellum
D. Microvillus
E. Lacteal
Answer: E
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Sperm enter the cervical canal through the external
A) isthmus. B) ampulla. C) fimbra. D) os. E) commissure.
In immature animals, the growth plate consists of ________________________________________
Fill in the blank(s) with correct word
The ability of white blood cells to leave the circulation and enter tissues is called
A. chemotaxis. B. diapedesis. C. margination. D. intrusion. E. exocytosis.
Which of the following statements is not a description of how skin protects the body?
A. The skin has dendritic cells that respond to pathogens. B. The skin's surface has an acidic pH. C. Cornified stratum corneum makes it hard for pathogens to enter. D. All of these are descriptions of how the skin protects the body.