Platelets become sticky and adhere to each other when exposed to ________.
A. fibrinogen
B. heparin
C. positively charged endothelial cells
D. collagen in connective tissues
Answer: D
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The hormone that the pineal gland secretes is
A. melatonin. B. myostatin. C. beta endorphin. D. melanoma.
The _______ of a sound stimulus is interpreted as its pitch and measured in hertz, whereas its _______ is the amplitude of the sound waves and is measured in decibels
A. frequency, timbre B. frequency, loudness C. timbre, loudness D. loudness, frequency
The most important factor influencing heat transfer by radiation is the relative humidity of the atmosphere
Indicate whether the statement is true or false
Jill felt small, swollen structures under her chin in her neck during a recent head cold. She probably had swollen ________
A) axillary lymph nodes B) cervical lymph nodes C) tonsils D) Peyer's patches E) inguinal lymph nodes