Calcium is very important to the normal functioning of the body, so it is very important that the plasma Ca2+ concentration be well regulated. In which of the following ways does calcium play an important role?
a. calcium plays an important role in the absorption of Vitamin D from the digestive tract.
b. calcium is important for maintaining the proper excitability of nerves and muscles.
c. calcium stimulates osteoblasts to lay down bone.
d. both (a) and (b) above.
e. all of these answers.
B
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Nociceptors are sensitive to
A) pain. B) light touch. C) vibration. D) osmotic pressure. E) blood pressure.
The chemicals that transmit signals across the synapse are called ____
a. sarcolemmas b. neurotransmitters c. synapses d. receptors
Viscosity refers to the friction developed between the molecules of a fluid as they slide over each other during flow of the fluid
a. True b. False Indicate whether the statement is true or false