What specialized feature of an epithelium consists of a reticular lamina, a lamina densa, and a lamina lucida?
A. Microfilament
B. Desmosome
C. Fenestrated membrane
D. Basement membrane
E. Plasma membrane
D
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Researchers are trying to determine the cause of circadian rhythm disruption in modern societies. They measured the hormone ________________ , which is associated with sleep-wake cycles in humans
Levels of this hormone are high at night and lower during the day. Fill in the blank with the correct word.
Diarrhea often accompanies intestinal infections. Why?
A) Loss of electrolytes will kill bacteria. B) Dehydration of the body will kill the bacteria causing the infection. C) The immune system increases the production of enzymes for added protection. D) Bacterial toxins enhance the secretion of KCl from the cells, which causes water movement into the intestine.
Approximately how many alveoli do the lungs contain?
a. 50 million b. 500 million c. 5 billion d. 50 billion e. 500 billion
Identify the components of the cardiovascular system
A) heart and blood vessels B) heart and blood C) blood and blood vessels D) heart, blood, and blood vessels E) blood vessels and lymphatic vessels