Dural sinuses contain
A) air.
B) mucous.
C) serous fluid.
D) venous blood.
Ans: D) venous blood.
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Your doctor has determined that you have a leaky right atrioventricular valve. This defect will be detected by an ECG.
Answer the following statement true (T) or false (F)
We can distinguish between sensations that originate in different areas of the body because
A) different sensory receptor types produce different action potential types. B) incoming sensory information is first assessed by the thalamus. C) sensory neurons from each body region synapse in specific brain regions. D) sensory neurons carry only one type of information. E) None of the answers are correct.
Antibodies are:
A. secreted by helper T cells. B. cytokines. C. immunoglobulins. D. composed of two polypeptide chains - a heavy chain and a light chain. E. phagocytes.
Membrane proteins that bind to signals by which cells communicate are called ________
A) receptors B) cell-identity markers C) enzymes D) carriers E) cell-adhesion molecules