The extrinsic clotting pathway
a. is initiated by platelet factor
b. is primarily responsible for clotting in tissues
c. has more steps than the intrinsic pathway
d. is set off when Hageman factor comes into contact with collagen in an injured vessel
e. has none of the above characteristics
B
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Which of the following is not a subatomic particle that makes up the atom?
a. ion b. proton c. neutron d. electron
Describe platelets and their origin
A) Platelets are derived by lymphoid stem cells that divide into lymphocytes and in the process shed some cytoplasmic fragments. B) Platelets are the remnants of the reticulocyte organelles during the maturation of a reticulocyte into a red blood cell. C) Platelets are precursor cells to the myeloid and lymphoid stem cells. D) Platelets are immature red blood cells. E) Platelets are cell fragments that develop from megakaryocytes.
Which statement about the effects of aging on the endocrine system is false?
A. Estrogen and testosterone decrease dramatically with aging. B. The increase of estrogen and testosterone cause osteoporosis. C. Some hormone levels remain high but target tissue may lose their sensitivity. D. Levels of hormones decline with age.
Which of these form the inner layer of the glomerular capsule and wrap around the capillaries of the glomerulus?
A. macula densa cell B. mesangial cell C. nephrocytes D. podocytes E. monocytes