the heart muscle is enclosed in the ……….. to protect it and facilitate its action
A. His fibers
B. left ventricle
C. right atrium
D. pericardium
Select your answer:
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Biodiversity Conservation › ViewWhat is poaching?
A. when people hunt wild animals illegally
B. eating wild animals
C. saving wild animals
Microbiology › View
Lymphocytes
A. possess MHC antigens for recognizing self.
B. have membrane receptors that recognize foreign antigens.
C. gain tolerance to self by destruction of lymphocytes that could react against self.
D. develop into clones of B and T cells with extreme variations of specificity.
E. All of the choices are correct.