The body system that provides support and protection as well as being a site of blood cell production (hemopoiesis) is the ________ system.
A. respiratory
B. muscular
C. cardiovascular
D. skeletal
E. lymphatic
Answer: D
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Calcium ions serve as messengers, often in combination with the intracellular protein
A) calcitonin. B) calcitriol. C) calmodulin. D) calcium-binding globulin. E) calcitropin.
In the condition of volume excess, fluid gain involves
A. an increase in osmolarity of body fluid. B. a decrease in osmolarity of body fluid. C. no change in the osmolarity of body fluid.
Peristalsis
A. is under voluntary control. B. involves the opening and closing of muscular sphincters. C. involves back-and-forth movement for mixing. D. is the alternating contraction of muscle layers in the GI tract wall that propels materials through the tract. E. All of the choices are correct.
The Q-R-S complex on an ECG represents ________
A) ventricular depolarization B) atria depolarization C) ventricular repolarization D) atria repolarization