Which of these characteristics of membranes is correct?
A) Mucous membranes line internal body cavities.
B) Serous membranes produce fluid that is secreted into the blood.
C) Most multi-cellular membranes consist of two layers of tissue (epithelial and connective).
D) Serous membranes are found lining the digestive and excretory systems.
E) Serous membranes are found lining the retroperitoneal organs.
Ans: C) Most multi-cellular membranes consist of two layers of tissue (epithelial and connective).
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A. centripetal force B. inertia C. both A and B D. none of the above
Aging of the immune system makes older people more susceptible to cancer and infectious disease because of a decline in ________.
A. prothrombin and fibrinogen B. antigen-presenting cells and helper T cells C. red blood cells and platelets D. alpha and beta globulins E. complement proteins
A not uncommon endocrine condition in the elderly is ________ which can lead to hair loss and mental sluggishness.
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During contraction of skeletal muscle fibers, the
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