Sodium, calcium, and bicarbonate are all described as plasma
A. solvents.
B. nutrients.
C. electrolytes.
D. proteins.
E. formed elements.
C
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T cells and B cells can be activated only by
A) pathogens. B) interleukins, interferons, and colony-stimulating factors. C) cells infected with viruses, bacteria, or cancer cells. D) exposure to a specific antigen at a specific site in a plasma membrane. E) disease-causing agents.
____________________ are chemical messengers that bind to neuronal receptors at nonsynaptic sites and alter the effectiveness of ongoing synaptic activity
Fill in the blank(s) with correct word
In single-unit smooth muscle, ________.
A. cells display pacemaker activity B. all cells receive direct autonomic stimulation C. cells do not respond to stretch D. norepinephrine binds to muscarinic receptors and closes K+ channels
The walls of lymphatic capillaries are only one cell thick.
Answer the following statement true (T) or false (F)