Which of the following is not true concerning the control of calcium metabolism?
a. PTH (parathyroid hormone) causes an increase in plasma calcium by activation of osteoclasts.
b. PTH increases renal reabsorption of calcium.
c. vitamin D causes an increase in secretion of Ca2+ into the lumen of the digestive tract.
d. calcitonin causes a decrease in plasma calcium by decreasing Ca2+ movement from the bone fluid into the plasma and by suppressing bone resorption.
e. when plasma calcium increases, PTH decreases and calcitonin increases.
C
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Under the microscope, which cell type is visible in a tendon slide?
A. Muscle fiber B. Reticular cell C. Collagen cell D. Fibroblast E. Mast cell
Breathing rate increases during exercise due to
A) a joint reflex. B) stimulation of the respiratory areas by decreasing blood concentration of oxygen and increasing blood concentration of carbon dioxide. C) all of the above. D) signals from the cerebral cortex to the respiratory areas when it also signals skeletal muscles to contract.
Archie has a resting heart rate of 125 beats per minute. Classify his cardiac dysrhythmia
A) heart block B) bradycardia C) asystole D) tachycardia
When acetylcholine binds to receptors at the motor end plate, the end plate membrane becomes
A) more permeable to sodium ions. B) less permeable to sodium ions. C) more permeable to calcium ions. D) less permeable to potassium ions. E) repolarized.