In a stimulated muscle fiber, the calcium ions released by the sarcoplasmic reticulum bind to the protein _______.
A. myosin
B. tropomyosin
C. actin
D. troponin
D. troponin
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The cells active in both innate and adaptive immunity develop from common pluripotent precursors in the bone marrow called
A) B cells. B) killer cells. C) stem cells. D) leukocytes.
About how many liters of blood does an average-sized adult woman have?
a. 1 to 2 b. 3 to 4 c. 4 to 5 d. 5 to 6 e. 6 to 7
Inhaling or "huffing" is a way to achieve a high, usually by breathing in a fat-soluble substance. Which of the following structures would be most likely attacked first?
A) neuron B) myelin sheath C) axon D) dendrite
What is not a function of parathyroid hormone?
A. It increases reabsorption of Ca2+ in the kidney. B. It increases calcium absorption across the intestine. C. It increases calcium production in the liver. D. It stimulates osteoclasts to dissolve calcium phosphate crystals in bone.