Malpighian tubules are part of the ______ excretory system
a. avian
b. mammalian
c. arthropod
d. reptilian
e. amphibian
C
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During pregnancy stroke volume can increase by
a) 10% b) 20% c) 30% d) 40% e) 50%
Nodal activity of the heart may be influenced or modified by
A) either the SA node or the AV node, but no other system. B) enzymes released from the kidney. C) the autonomic nervous system. D) the somatomotor cortex. E) hormones secreted by the lungs.
Which of the following best describes the term Z line?
A) protein that accounts for elasticity of resting muscle B) repeating unit of striated myofibrils C) thin filaments are anchored here D) storage site for calcium ions E) largely made of
Which of the following molecules acts as a buffer during the chloride shift?
A. carbon dioxide B. hemoglobin C. carbonic anhydrase D. water E. bicarbonate ion