________ results when a person receives a vaccine that triggers a primary immune response and leaves memory T and B lymphocytes to initiate an attack if the pathogen reenters the body.
A. Naturally acquired passive immunity
B. Artificially acquired active immunity
C. Artificially acquired passive immunity
D. Naturally acquired active immunity
Answer: B
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The mediastinum
A) contains the pleural cavities. B) separates the pleural cavities. C) contains the pericardial cavity. D) contains the pleural cavities and pericardial cavity. E) separates the pleural cavities and includes the pericardial cavity.
Which of the following lists contains only trace elements?
A) sulfur, chlorine, oxygen B) selenium, hydrogen, calcium C) boron, oxygen, carbon D) silicon, fluorine, E) cobalt, calcium, sodium
Describe the two primary types of glands
A) Endocrine glands release their substances into the interstitial fluid; exocrine glands release their secretions into ducts that open onto an epithelial surface. B) Endocrine glands release their secretions into ducts that open onto an epithelial surface; exocrine glands release their substances into the interstitial fluid. C) Mucus glands secrete mucus through a duct to the inside surface of body; sweat glands secrete sweat through a duct to the outside surface of the body. D) Sweat glands secrete sweat through a duct to the outside surface of the body; oil glands secrete sebum through a duct to the outside surface of the body. E) Endocrine glands release their substances into the interstitial fluid; exocrine glands release their secretions through a duct to the outside surface of the body.
Which of the following describes the blind spot?
A. There are cone cells but no rod cells. B. It is where the iris casts a shadow on part of the retina. C. It is where the optic nerve leaves the eye. D. It is where bipolar cells block light from reaching the rods and cones. E. There are rod cells but no cone cells.