The color of urine is determined mainly by ________.
a)diet
b)filtration rate
c)byproducts of red blood cell breakdown
d)filtration efficiency
c)byproducts of red blood cell breakdown
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In addition to a need to acquire oxygen and to eliminate carbon dioxide, other responses such as emotional and ________ often affect the pace and depth of respiration.
Fill in the blank(s) with the appropriate word(s).
Muscle tension is produced internally within the ____
a. myosin molecules b. actin molecules c. T tubules d. sarcoplasmic reticulum e. sarcomeres
The thyroid gland secretes a hormone that uses a second-messenger system at target cells
Indicate whether the statement is true or false
Which of the following membranes acts as a rigid roof over the cilia of the hair cells of the spiral organ, causing the cilia to bend against it when sound waves are present?
A. Tectorial membrane B. Basilar membrane C. Vestibular membrane D. Cochlear membrane E. Tympanic membrane